Costco vs. Walmart Showdown: Here's Who Has the Cheapest Price on 11 Things You Buy All the Time by Gina Zakaria Costco and Walmart are known for their competitive prices on everyday items. But who actually has the better deals? As a frugal shopper, I always strive to find the best prices on common household goods. So, I went on a quest to find out if Costco or Walmart offered the best prices on everyday items when they’re not on sale.