Your location would be a big help..
If someone in Alaska has one for sale and your in Florida I'm sure you'd probably try to find one closer lol. Good luck with your search. Try asking on 3wheelerworld.com.
Your gonna pay for a good one. I decided to build my 200x from parts because it wasn't going to be that much more expensive, and I'm going to end up with a much nicer rig. Any used machine 30 years old is likely to be a turd unless it's pretty much museum quality, which will fetch 5k+