Yeah, Farmgirl and Unregistered above have some good points. I agree.
Better to buy it fresh and avoid trouble. Its considered an illegal drug in dried form / crystal. Also, San Pedro/ Peruvian Torch is much cheaper and easier to come by.
I've purchased it before online locally in Canada. There is a shop called Cactus Kingdom that sells all manner of ethnobotanical cacti mail order. You need about 12 inches of Pedro for a trip, or multiple buttons of peyote. On a time scale, growing Pedro/ Torch is must faster and more economical and easier!
Peyote is rewarding enough to grow for its beauty, probably not worth eating after you have spent a decade growing a larger enough button.
Thank God we live in Canada Eh?