@Graham; Despite the rise in popularity of RVs it's still a buyers market when it comes to vintage bus conversions. Nevermind having space for one, they are all custom, and you need to be mechanically apt to own one, like any vintage vehicle, or deep pocketed, and those people tend to go for new matchsticks and fiberglass boxes. The old timers that built them decades ago are sadly passing or passed on, and their families usually don't know what to do with them. If you look in to it, do your research, decide on what you want, and keep an eye on it you can find them for surprisingly cheap for what they are. Some between scrap price and free especially if they've been sitting and need lots of work, but those may require some significant resources to get home/going.