Check on Pickwick lake and the Tenn & KY rivers in late summer and fall. Bookmark Craigslist in water access cities as well.
Look at the lower price sites. Boattrader.com, Boats.com, Iboats, etc.
Yachtbroker has the better / higher price boats. Use them gor better info and pictures.
Use Boatsearch 101 on this site, and the maker forums here and directly (Defever, Grand Banks, Mainship, etc)
Be sure to budget for insurance, dockage or haulout, and $$$ repairs, especially those that don't show up on the survey.
Budget for surveyS. And get some books on boat repairs and surveying, so that you have an idea of what the problems could be.
Good luck, JohnS
Cheoy Lee 40 LRC