I will not go into detail on what I understand to be the pragmatic considerations here, since the lesswrong morality encourages a more conservative approach to choosing what to do.

The life-extentionists over at imminst.org tend to be experienced in acquiring whatever they happen to need to meet their health and cognitive enhancement goals. They tend to give a fairly unbiased reports on the best way to go about getting what you need, accounting for legal risks, product quality risks, price and convenience.

I do note that when I want something that is restricted I usually just go tell a doctor that "I have run out" and get them to print me 'another' prescription.