'Round Arizona here are some of the most uncommon drugs to find...
Amobarbital (Tuinal)
Pentobarbital (Nembutal)
Secobarbital (Seconal)
K'd - pentobarb and secobarb are used in very large amounts by vets for euthanasia. If you can get large amounts of ketamine, could the same source not get same of one the barbiturates (it's generally a blue soln to indicate it's not sterile), as they both come from the same source - vet. medicine supplies.
Riemann Zeta
From what I've read, I think fencamfamine acts mainly as a reuptake inhibitor, but also has some neurotransmitter release action as well. A "well known" chem firm was the source of the raecaemic fencamfamine, before it got returned to the misuse of drugs act (they used to supply it in dinky little 5g bottles - hours of fun!)