What is the best place to purchase high quality spices and herbs? Preferably somewhere on-line.
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There is no one best place. A lot depends on what you are looking for.
I've never used them myself, but Penzeys scores very highly for both on-line and in-store purchasing. www.penseys.com
The go-to shop, for many professionals and serious home cooks is Kalustyans. You can reach them at www.kalustyans.com. If you find yourself in New York, be sure and visit them. But bring a large box and a bunch of cash, cuz you'll suddenly discover all sorts of things you can't live without.
For top quality saffron and vanila, at the best prices, the place is Vanilla Saffron Imports at www.saffron.com
If there are ethnic and specialty shops in your area be sure and check them out as well.