I'm in the exact same boat...uh, bus... Looking for a full time live in, except I'm on the other side of DC... Maryland. Planning on getting one, converting quickly, and driving to Arizona this November. But I hope to be living in it before then. My family and friends just don't understand... and I don't care to explain. Heheh. But, I didn't explain why I just up and moved across the country when I moved to san diego, and I didn't explain it to them when I up and moved back to the east coast 4 years later...
Anyway...
There seem to be a number of them around, but I'm very cautious about rust, and probably moreso about any that were previously owned by any big city transit authority. If you've spent any time in DC, Baltimore, or Philadelphia, you'd understand why.
Good luck with your venture!