govdeals.com has many buses listed from various parts of the country. There are some currently on there from GA, TN, NC, VA, and FL. The nice part with govdeals.com is that you can get the contact number and talk to to the bus mechanics that worked on them. Most of the ones I talked to would give you the details about the bus and its condition (they don't have a vested interest if the bus sells or not). They told me about the problems any of them had, rust issues, transmission types, rebuilds of any kind, and so on. I'm in NC and while searching for a bus I did notice that it was hard to find anything in SC (govdeals, craigslist, etc...). You might want to contact the bus garages of some of the surrounding school districts to see if they have anything and/or how they surplus thier buses down there. Also there is a bus dealer out of VA that we went and visited http://www.sonnymerryman.com/
they have ALOT of buses. Many were out of our price range but it was nice to be able to walk the buses, get measurements, and find what you like and don't like. The salesman is a nice guy there and was helpful, but he is a salesman. Another service you might want to try is searchtempest.com (there is a thread on here somewhere that someone shared), it will allow you to search craigslist postings with in some many miles of your location. Good luck with your search.