Hello fellow Marylander, welcome. 500-600$ is more than enough to find a 240, especially if you are only looking for a rolling chassis. In fact if they are any more then that, the seller is crazy. When looking for a chassis rust is the main issue. There are obvious spots for rust like under the wing on the hatch. Make sure the frame has no rust or you will have issues. Good luck with finding one, im in search of one too actually.