Costco can be a great place to find good deals on the foods you eat every day. But there are a few areas where your local grocery store or a big box store like Walmart and Target can offer better value for your money. That's primarily why Charlene Haugsven, founder of MyFrugalAdventures.com, tells CNBC Make It, "Just because Costco has it doesn't mean it's a bargain." However, the reason grocery experts put these items in the "don't buy" category comes down to the size. Cereal, especially the name brand variety, is also often a good buy at your local grocery store, big box store and even at the drugstore.

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