I agree with Jamboo. As a rogue, I looked into buying some fadeleaf when I first got the ability, but saw the outragous prices and just got my Herbalist alt and some guildies to hook me up. After the 2.1 patch, Blinding Powder is now very common in the junkboxes and I always have a stack on hand in my bag and extras in my bank. If I work up two full stacks, one goes on the AH for about 4g and I keep the other and keep pickpocketing to get some more.