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.
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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.