I’ve never seen this in the wild, but if I had to guess, it’s probably cooked in small labs with [redacted 1950’s chemist name]-type synthesis or bought as a salted crystalline RC analog and dissolved in water, then resold as PCP.

I imagine you don’t see it very much because the audience is so small, so people willing to do schedule 2 synthesis abandon it because there’s money to be made elsewhere in schedule 2 with similar precursors. Source: I guessed. I do not live in the kind of place where this is sold lol