Costco (NASDAQ: COST) and Walmart's (NYSE: WMT) Sam's Club dominate the warehouse club space. Both use similar operating models where you have to join to get in and both offer spartan stores with a limited selection of low-priced items.
You can save a lot of money shopping at these chains, but that's not guaranteed, and there are lots of mistakes you can make. These tips and tricks should help you get the most out of your membership or just be a better-informed shopper.
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