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You Should Definitely Be Buying These Things At Costco

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20. Butter
Did you know you can freeze butter so it keeps longer? That's good to know if you are buying four pounds of butter at a time. And you should, because the price is incredible. Even with the extra that Instacart charges, this four pack of butter is just $9.23. Supermarkets sell one pound of butter for around $4.99 for one package, and this is four!

Plus, Costco's Kirkland butter is high quality. I use it all the time for baking and cooking. If you prefer salted butter, they have that as well.