Costco, Walmart, and your neighborhood grocery store can all offer great value, but figuring out which one actually saves your family the most money is harder than comparing receipt totals. Package sizes, promotions, membership costs, and even how you shop can completely change the math. The good news is that you do not need a complicated spreadsheet to settle the debate. A few simple comparisons can reveal where your grocery dollars go furthest and help you build a shopping strategy that could save you money week after week.