2 stroke or 4 stroke? You can pick up some late 90's 3arly 2000's Honda TRX400's for about 2k, and they'll be in decent shape, but need some minor fixes. I just bought one for 2,600 and it only needed a new seat cover and a new valve cover gasket.
If you're looking for quads that are 125cc and smaller, there are lots to be had for under 1,500 bucks. Fixer uppers for around 800 or so. Facebook Marketplace is where most of them are. craigslist is kind of a joke nowadays.
The old Honda trail 90's are stupid expensive, even as a basket case.
Gary