Probably because there isn't any chinese labs I'n aware off pumping it out in bulk. The 2-oxo-pce arround probably is coming from custom synths, which are not cheap. We've seen a drop on the 3-meo-pce price since a mainstream chinese lab is selling it on bulk on the clearnet.
I supose my huge permatolerance to dissos is the main reason I don't enjoy 3-meo-pce, 2-oxo-pcm or ketamine. Maybe taking higher doses woul change my mind about them.