Hey!! I have another idea, very similar to the Salvia Divinorum one. I am a regular buyer of something called Kratom. I do not know where this is banned at this point, but it is addictive, and for me it's much like... Opiates! I love the stuff, you can get it wholesale pretty affordably, and then soak us addicts for profit.
It is actually very affective for opiate withdrawl, sells like crazy, and very pleasant to use.
By the way, the reason I mention this.. Is I wouldn't mind the sellers having some competition. Maybe then those like me can get a deal. lol
What better to sell, than something that is addictive? If your product is good, your customers will come back again and again.