I'm looking for a vendor of some 4fmp, however I am having a very hard time finding any actually, I've looked at most markets already. Maybe there's another name for it that I'm not aware of as it is my first time wanting to try it out (I normally use XTC/MDMA).
Not sure if this will help, but Grams shows some listings for 4fmp:
http://grams7enufi7jmdl.onion/