Costco vs. Sam's Club vs. BJ's: Why These Three Warehouse Clubs Price So Differently

Costco, Sam’s Club, and BJ’s Wholesale are often grouped together as warehouse clubs, but that label hides important differences in how each retailer builds assortment, negotiates with suppliers, and sets prices. Costco operates with fewer than 4,000 active warehouse SKUs, Sam’s Club has historically carried roughly 6,000–7,000 items, and BJ’s reports approximately 7,000 core active SKUs. Those assortment structures affect far more than consumer choice.

For brands, suppliers, and pricing teams, they determine whether an exact product match exists across all three clubs, how much room each retailer has to move on margin, and whether a price difference is meaningful at all. Costco may carry a club-specific pack or limited-duration item that has no direct equivalent at Sam’s Club or BJ’s. BJ’s may stock a smaller or more supermarket-like pack, while Sam’s Club can offer a broader national-brand assortment. Competitive monitoring therefore has to account for SKU structure, markup logic, membership economics, payment rules, and geography before declaring that one warehouse club is “cheaper” than another.

Assortment size is one of the most important structural differences between the three clubs. Costco’s latest annual reporting says its core warehouse business carries fewer than 4,000 active SKUs per warehouse, compared with approximately 9,000–10,000 products online. The company deliberately limits most categories to fast-selling models, sizes, and colors because concentrated volume improves inventory turnover and purchasing efficiency. That limited-SKU strategy means each shelf position carries more commercial weight than it would in a conventional supermarket.

Sam’s Club has traditionally operated with a somewhat wider assortment. Company executives have described the club as carrying roughly 6,000–7,000 items, while Walmart filings show an ongoing balance between national brands and the expanding Member’s Mark private-label assortment. That broader catalog creates more opportunities for suppliers and gives Sam’s Club more room to offer alternative sizes, brands, and formulations within the same category. For price monitoring, it also increases the probability of finding something close to a Costco item without guaranteeing an exact match.

BJ’s is broader still. Its filings report about 7,000 core active SKUs, and BJ’s has long emphasized smaller, more convenient pack sizes than competing warehouse clubs. Wellsley Farms and Berkley Jensen sit alongside national brands, while the retailer has historically used supermarket-style package sizes more often than Costco. That makes BJ’s useful for shoppers who want warehouse economics without always buying the largest available format, but it complicates direct B2B comparisons.

The real problem is product identity. Costco’s limited assortment frequently includes exclusive pack configurations, custom multipacks, and products built specifically for its warehouse format; Costco itself describes exclusive packaging and limited “treasure hunt” items as part of the model in some markets. An exclusive Costco configuration may therefore have no identical UPC at Sam’s Club or BJ’s, even when the underlying brand and product family are the same.

That changes the methodology for competitor monitoring. When an exact UPC, GTIN, model number, pack count, or formulation is available at all three retailers, SKU-level comparison is appropriate. When it is not, the benchmark should move up one level to category, product segment, normalized unit price, or closest comparable configuration. Treating a Costco-exclusive 24-pack and a BJ’s 12-pack as identical products without normalization does not measure competitive pricing; it measures packaging differences.

Warehouse-club prices are also shaped by different approaches to merchandise margin. Costco is the clearest example because its pricing philosophy includes a widely documented ceiling of roughly 14% over cost for branded merchandise, with a somewhat higher limit historically associated with Kirkland Signature. Costco’s own customer-service material states that branded products are not marked up by more than 14% in its U.S. and Canadian pricing model. That policy helps explain why Costco’s merchandise economics behave differently from retailers with more freedom to expand gross margin by category.

Costco’s markup ceiling should not be confused with a 14% gross margin. The markup is applied to merchandise cost, while reported corporate gross margin reflects a broader accounting measure and has recently been closer to 11% of net sales. More importantly, the cap creates a pricing constraint: when acquisition cost falls, Costco has less incentive to preserve the extra spread as permanent merchandise margin. Membership income, high volume, and rapid inventory turnover carry more of the economic burden.

Sam’s Club and BJ’s do not operate under the same publicly documented 14% ceiling. Sam’s Club combines Walmart’s price-value reputation with Member’s Mark, national brands, promotions, and supplier terms, while BJ’s gives itself more assortment and pack-size flexibility. Membership income is still important at both clubs, particularly Sam’s Club, where Walmart describes membership income as a significant component of operating income.

This is why “which club is cheaper?” is not a stable analytical question. Costco may have the lowest unit price on one high-volume national-brand pack because its markup structure and procurement scale compress the retail price. Sam’s Club may be lower on another item because of a supplier-funded promotion, while BJ’s can produce a better effective comparison through a different pack size or coupon structure. The relevant benchmark is the price generated by a particular category, supplier relationship, and package configuration, not an assumed warehouse-club hierarchy.

The base membership prices of the three clubs are now remarkably close. As of 2026, Costco charges $65 annually for Gold Star and $130 for Executive membership, while Sam’s Club charges $60 for Club and $120 for Plus after its May 1, 2026 increase. BJ’s currently lists Club membership at $60 and Club+ at $120.

Similar annual fees do not mean the three retailers use membership revenue in exactly the same way. Costco’s model is the most tightly linked to low merchandise markup, and the company had 148.5 million cardholders by May 2026. High renewal and enormous purchasing volume allow Costco to treat member retention as part of its pricing engine rather than simply as a loyalty program.

Sam’s Club also relies materially on membership income, but its operating model sits within Walmart and incorporates a broader set of retail, fulfillment, and digital capabilities. The May 2026 increase moved Club from $50 to $60 and Plus from $110 to $120, confirming that membership economics continue to matter to the format. BJ’s uses a comparable two-tier structure but adds an unusually relevant pricing variable: manufacturer coupons can be combined with eligible BJ’s offers, which the retailer continues to highlight as a membership benefit.

For competitive monitoring, membership fees should not simply be added to every observed SKU. They should be modeled separately and amortized only when the objective is to estimate effective acquisition cost over a defined annual spend. Shelf price, rewards, membership expense, and coupons represent different pricing components. Keeping them separate makes cross-club comparisons reproducible.

The three warehouse chains also operate on very different geographic scales. Costco is a genuinely global business, with 933 warehouses as of July 2026 across the United States and Puerto Rico, Canada, Mexico, Japan, the United Kingdom, Korea, Australia, Taiwan, China, Spain, France, Sweden, Iceland, and New Zealand. Its membership base exceeded 145 million cardholders in fiscal 2025 and continued growing during 2026.

Sam’s Club is much more U.S.-centered but still has meaningful international operations. Walmart reported 601 Sam’s Club U.S. locations in fiscal 2026, while Sam’s Club’s own international support currently references operations in the United States, China, Brazil, Mexico, and Puerto Rico. Its competitive overlap with Costco is therefore significant in North America and selected international markets, but not universal.

BJ’s remains regional by comparison. The company reported 8.5 million members in 2026 and has been expanding beyond its traditional Northeast base, with new clubs in states such as Kentucky, Florida, and Indiana. Even with that expansion, BJ’s footprint is still concentrated in the eastern United States rather than operating as a global warehouse network.

That geographic asymmetry matters for pricing intelligence. A national average comparison can imply competition where no meaningful local overlap exists. Monitoring should therefore begin with market intersection: which clubs actually compete for the same customer, in the same region, for the same category. Regional pricing pressure is more useful than a universal warehouse-club average.

Monitoring Costco, Sam’s Club, and BJ’s at scale requires more than collecting three headline prices. The assortment problem alone creates thousands of cases where an exact SKU exists at only one club, appears in a different pack size elsewhere, or is replaced by a private-label alternative. Pricing models, memberships, coupons, fulfillment channels, and regional availability add further layers. A useful monitoring system has to preserve those differences instead of flattening them into one comparison field.

The first requirement is accurate product matching. Exact UPC or model matching should be used where possible, while comparable-product matching and normalized unit prices are more appropriate for exclusive or differently configured club packs. Historical price data is equally important because temporary markdowns and promotions should not replace the normal competitive baseline. Regional information also matters when the clubs do not overlap equally across markets.

Priceva supports automated competitor monitoring, price-history collection, alerts, matching services, regional monitoring, and comparable-product tracking. Its dedicated Costco solution can monitor Costco.com and physical warehouse pricing, while the broader marketplace and retailer-monitoring environment covers large multichannel datasets in a single interface. This makes it possible to treat warehouse-club pricing as structured competitive intelligence rather than a manual spreadsheet exercise.

Businesses focused on Costco can track Costco pricing automatically. Teams building a wider competitive dataset can also monitor pricing across marketplaces and retail platforms, while the related analysis of how Costco compares with Walmart and Amazon provides another view of how retailer business models affect benchmarking.

Not consistently across every product or category. Costco’s approximately 14% branded-product markup ceiling and concentrated assortment can produce very aggressive unit pricing, but Sam’s Club and BJ’s have greater assortment and promotional flexibility. Pack sizes, supplier terms, private-label alternatives, and coupons can reverse the comparison on individual products. The correct benchmark is therefore category- and SKU-specific rather than a general ranking of the three clubs.

Costco carries fewer than 4,000 active warehouse SKUs and concentrates unusually high sales volume into each listing. That model encourages custom multipacks, limited-duration products, and exclusive configurations that differentiate the assortment and fit Costco’s pallet-based operating economics. An exact equivalent may therefore be unavailable at Sam’s Club or BJ’s. Competitive monitoring should use normalized comparable products when a direct UPC match does not exist.

There is no universal rule because vendor acceptance depends on category, economics, demand, and buyer strategy. Costco’s exceptionally narrow SKU count creates intense competition for each shelf position, while Sam’s Club’s roughly 6,000–7,000-item assortment and BJ’s approximately 7,000 active SKUs provide more assortment capacity. BJ’s has also emphasized regional assortment, national brands, and smaller pack formats. These structural differences can create more entry points, but they do not guarantee easier supplier approval.

A standard Mastercard credit card can be used on Costco.com, but U.S. Costco warehouses currently list Visa as their accepted general credit-card network. Debit-card and certain specialty-payment exceptions exist, so “Visa only” refers specifically to ordinary warehouse credit-card acceptance rather than every possible payment method. Sam’s Club and BJ’s accept a broader selection of major credit-card networks. Payment policies should be rechecked periodically because retailer agreements can change.

Yes, but meaningful tracking requires product matching and normalization rather than simply scraping visible prices. Costco-exclusive packs, different BJ’s sizes, private labels, local assortment, and regional availability can make raw SKU-to-SKU comparisons misleading. Price history and comparable-product matching help distinguish true competitive price movement from assortment differences. Priceva’s marketplace and retailer monitoring tools can support that broader workflow, while its Costco price tracker handles Costco-focused monitoring.

The three retailers do not compete in identical markets. Costco operates globally, Sam’s Club has a large U.S. footprint plus selected international operations, and BJ’s remains concentrated primarily in the eastern United States despite recent expansion. A national comparison can therefore overstate competitive pressure in markets where only one or two clubs are present. Regional overlap should be defined before price gaps are interpreted as evidence of competitive action.