Absolute cheapest mobo for a 3600x? I'm not above FB Marketplace

I juggle four computers and try to keep them (more or less) current enough to handle modern games at 1080p/60fps.

This requires a lot of juggling of parts for upgrade season.

It's time to retire my i5 6500, and I found a good deal on a used 3600x ($30).

I'm looking for the cheapest motherboard that will support a 3600x without needing a bios update (as I'm told that bios updates require an older series Ryzen slotted, which I don't have).

I don't need anything special. I'll slot 16gb DDR4 and it's plugged in with ethernet. Don't need bluetooth, nvme, wifi, etc.

Suggestions?