Meh it's the classic black market vs white market debate, where here the white market is a huge oligopoly with insane markups to pay off lobbyists / regulator / advertisers / the rich people who own the pharma companies. Sometimes the black market is even more expensive but in DIY it often isn't.

If it were me I'd just make it all in one go, hopefully enough to be set for life, huge pile of it whatever drug I need to stay alive. Create a homogeneous mixture, GC/MS the mixture for purity and then package it for long term storage.