Welcome form the dark side, I mean the East Side!
Our dealer is in Columbus (Caldwell Airstream) and occasionally has a used model.
I don't know how far you're willing to travel to get one, but Colonial Airstream in New Jersey usually has pre-owned units (ColinialAirstream.com - look foe used inventory).
Other than that, the good places to look are mentioned above - good luck!
Steve & Susan
2005 28' CCD, 2011 Sierra 5.3L, Equal-I-Zer
Empty Nesters - spending our money on OURSELVES for a change!