Now that I think about it, there is one shop in Washington Township (Warren County) that I seem to remember carrying a few used bikes. I can't remember the prices though. It was definitely an old-timey bike shop, with very limited hours (couple times I went there, seems the retirement aged proprietor was the only one working there). If you're anywhere close, might be worth checking out.

http://www.mccormicksbicycle.com/history.php

What size frame are you searching for, by the way? Some of us have way too many bikes.