To score a useable machine in that price range borders on the miraculous. Worth gloating over, in any case. It's not that there are not any around, but it's along the lines of answering an ad that wants to sell "an old chevrolet" and finding a mint 'Vette on blocks in a barn . It has happened, it will happen again, it might happen to you, just don't expect it to happen to you.
Get a machine that you can actually do any work on, with tooling, for that price, and people start throwing rocks at you. :-)
If you buy a bare machine, count on spending pretty much the cost of the machine or more, on tools and tooling to make it do what you need it to.
Cheers Trevor Jones