catalytic converter

In related threads: https://www.supramkv.com/threads/ecutek-tune-causing-obdii-emissions-to-fail.23749/ https://www.supramkv.com/threads/wtb-a90-oem-downpipe.23750/ I discuss having some issues with passing emissions due to my aftermarket work. I'm trying to source a 2020 Supra OEM Catalytic...

A couple months ago I picked up an aftermarket cat (EPA compliant, not worried about smog) I'm wondering what would be the value of the stock cat if I were to sell it, and where the best place to sell it would be.