You should try calling the bus barn and see if they are selling off any shorties.
For that matter you should call all the local bus barns and see what is coming up for sale soon. You might be amazed at how many are sold without public notification. I know Waterboro sold a couple buses via "sealed bid" back in December and the only mention I found of it was in a local paper (whole paper is 8 pages). Keep in mind though that buses are generally sold at the end of the year so the market is not good right now for buyers. Come June and there will be more available.