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This is a short but interesting post the thekitchn.com about the advantages of buying whole spices and grinding them as you need them. The advantage of grinding whole spices is that they taste better and stay fresh longer. This article explains why. If you go to this link you can search for whole spices and price them out to see if this is an approach you’d like to take.
Click the The Case for Buying Whole Spices link below to read the full article.