They are on ebay all the time....well, so to speak. I bought mine over the winter and put it together as a time-killer.
Models I have some of the first issue GSX,the white GSX first run street machine,the 4 diff GN/GNX kits plus 2 70 resin convertible kits WITH boot that i had made long ago,the winshield posts need gluing but otherwise hey are new,AJ