... 150$ S9s? Please do you have any link or contact? All what I've found it's 385usd per unit.
Used via Kaboomracks, but they are back to 230ish now. A few months ago when bitcoin was under 4k... And along those, the used M3s from Pangolin at $50 (now gone), oh and the m3x back then was $75.
I made this capture from the Pangolin shop in January:
