Why?
Just buy them from the African blokes selling novelty tourist trinkets.
Pretty cheap and damned good.
We had a guy called Max who we did some business with, the stuff was weak and shit however did teh trick, he was african. Dont do lots of drugs then have to wait an hour for your cab to the club as it will mean you have to buy off teh english and they blow your head away resulting in hugging a bollard for 4 hours while buzzing your tits off