I’ve found that Costco’s Kirkland brand is the best value and quality. Aside from that, shopping for diapers at Target when they have their spend $X get gift card for $X is a good deal! Otherwise Walmart’s big box of diapers is the best value. Stay away from regular grocery stores (Albertsons, Kroger, Ralphs, Vons) and pharmacy’s (CVS, Walgreens), their prices are always higher!