A Consumer Reports analysis comparing shopping basket prices across multiple retailers found that warehouse membership clubs like Costco and discount supermarkets generally offer lower overall pricing than Wal-Mart, with a particularly significant advantage when buying in bulk. Prices on Amazon and at Ralphs are highly dependent on specific product categories, being competitive for some electronics and household goods but not necessarily for fresh groceries. Grocery Outlet Holding frequently achieves the lowest prices on several core daily essentials like flour and eggs. Researchers advise consumers to flexibly choose stores based on their shopping list rather than buying all items from a single supermarket.