The cheapest place to buy diapers in bulk depends on whether you prefer or store brands . For absolute lowest unit price, Walmart (Parent’s Choice) often leads at approximately $0.10 to $0.15 per diaper . However, Sam’s Club is widely cited for beating Costco on bulk unit costs for its house brand. Bulk Retailer Price Comparison (Estimated 2026)
Research shows diapers frequently beat Costco's Kirkland in price-per-unit, sometimes saving several dollars per bulk box.
Strategic buyers use the promotions alongside the 5% RedCard discount to reach prices as low as $0.17 per diaper for name brands. Strategies for Maximum Savings 14 Ways to Save Money on Diapers - What to Expect
Widely considered the cheapest overall for its brand, often starting at $0.10 per diaper. It is the best option for parents without a warehouse membership. Sam's Club
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