Actually there are quite a few in Arizona, and many are daily drivers. No rust in the desert. There are a number of guys here in Tucson (the Bus Mob) and in Phoenix (Arizona Bus Club). The Arizona Bus Club has a major camp out once a year in Jerome, Arizona where we raffle off a restored Bus once a year. We're having our 25th Jamboree this September. Check it out.
http://www.azbusclub.org/