Buy: Organic berries
One exception from the fresh produce rule is organic berries. If they’re in season, you can find a great deal on the berries. Of course, berries have great health benefits, and they can be pretty pricey.
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Skip: Flour, baking powder, and dried yeast
Baking ingredients like flour, baking powder, and dried yeast have a limited shelf life. People have cautioned buying these items in bulk since they can go bad rather quickly. So skip the big purchase and buy them in smaller amounts.