if avoiding the ebay route - you might check out use dealers like keh camera brokers. some say they are rather expensive, but i have found their prices for large format lenses to be okay, and their descriptions to be accurate.
you might also check out a place in oregon - equinoxphotographic.com -
they usually have a bunch of large format camera gear, and their prices are really reasonable, not to mention they are really nice folks. they guy that runs it, is an avid photographer so he can also answer questions you might have if you are looking for lenses & stuff.