The M477fdw is pretty solid. You can find parts and manuals aplenty for that.

Definitely check before you buy a used HP to see if there is a firmware lockout for toner. I have seen other newer models complain about counterfeit toner and still print.

That being said, I endorse HP printers. They are anti-competitive and have terrible software.

No problems with their enterprise desktops, but again, buy used!