Ask around your area, but some places it is really hard to come by. Here we have a thing called shwagstock (big music festival for a few days) a few times a year and it is a great place to come by things like that and all other sorts of things. If you have something like that around you try going there. I dont know how to make it, but I have heard it isnt easy and involves a lot of chemicals, and with things that strong/potent I wouldnt risk making it and consuming it yourself unless you knew absolutely what you were doing.