It may be difficult to aquire the cactus, although in my country it is commonly used for landscaping and ornamental purposes. Mushrooms, which have an amzaing spiritual side to them are quite easy to grow and the spores are commonly used for microsopic use. In my country they are not illegal to possess, but it is illegal to grow them. I wish you the best of luck though. Keep your eyes peeled and your head up, you never know what one might come across.