I've done a veriety of "rare" research chems, but I guess these were the hardest to get my hands on or the most uncommon.
Bromo-Dragonfly
3,5-methyloxy-amphetamine
2C-N
2C-G
3C-E
On the streets I've come across the following "rarities"
DMT
MDA and MDMA crystal
LSD crystal (tiny chip)
DPT oil
DOB
Oxymorphone
Alprazolam powder
Normethadone
Fentanyl Citrate ampules
Versed ampules (Midazolam)
Tremodil amplues (Diazepam)
I probably shouldn't have added some of the ones I did because some of you can get them with ease and I probably should have added some that I didn't because I'm used to them coming easily.