Fair price for push button stuff?

A few years ago, I used to get $150 for the whole good working and undamaged setup. Not sure what the market is like now. Probably getting a bit harder to find, but, is there much demand now?
No idea but I'm selling a lot of stuff to one guy so just trying to figure out what a fair price is plus replacement for the factory manual replacement parts. $150 a few years ago is over $200 day just for anything never mind ever more hard to find parts.