Grocery price check: Do store costs actually differ much?

A local price check of five staples across Grocery Outlet, Ralphs, Amazon Fresh and Costco finds prices are generally close, with small item-level differences (potatoes cheaper at Grocery Outlet, eggs cheaper at Ralphs). Totals ranged from about $19.93 at Costco for a bread item bought in bulk to $25.26 at Ralphs, with Amazon Fresh at $21.52 (delivery minimum applies). The takeaway: shopping across stores can save a little, but bulk sizes, memberships and delivery fees—and even gas costs—can influence overall savings.