Buy: Organic berries
The one exception from the fresh produce rule is organic berries. If they happen to be in season, you can find a great deal. Of course, berries are extremely healthy, and they can be pretty expensive.

Buy Organic Berries
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Skip: Flour, baking powder, and dried yeast
Assorted baking ingredients like flour, baking powder, and dried yeast all have a limited shelf life. People have warned others about buying them in bulk since they go bad pretty quickly. So, skip the big purchase and buy them in smaller amounts.

Skip Flour, Baking Powder, And Dried Yeast