I'm a long term Kalustyan customer -- visiting their store in Murray Hill.. However, now living on the West Coast I've started to mail order whatever I need.
I purchases number of spices recently including Ghost Peppers, Sumac, and Black Cardamom!
Everything as always excellent. I'm really enjoying the Ghost Peppers which aren't as hot is you might think but definitely add a lot of sweet heat to any dish.
I've been using them both as flakes and also grinding into a powder!