I'd like to add Vintage Trailers Plus
to this thread, since it also qualifies as a "good Airstream sale site."
We bought our '63 GT from the owner, Mr. Blair, and had a very good buying experience. His trailers are mostly very reasonably priced, and in most cases for good reason: we'll have to gut and do a frame-off resto of this puppy, who's been sitting in the rainly Pacific northwest for 40 years with a broken window and no skylight cover. A bit musty
In fact, my wife and I tell people that when we brought it home in early December, it was just about the same time that the flu epidemic spread from Washington and Oregon to the midwest states.. the identical path we took with out moldy little 10-foot friend. Sorry Wisconsin - we're keepin' it there for now!