Watch the thrift stores...
A little known or remembered resourse is the thrift stores such as the ones run by Salvation Army or other service organizations (here in Reno, it's WARC, ASPCA, American Cancer Society, Kiwanni's, etc...). These organizations usually will pick up donations of used appliances and then be happy to sell them for whatever they can get, usually without putting a premium price on it for being a collectable model. Also, the weeding out of junk has pretty much been done for you as they usually require the donations to be in reasonable shape and working. If you can talk to the people who work in the department who oversee the pickups and let them know what you're in the market for, they might keep an eye out for you and call if some tidbit shows up. You can't catch a prize if you don't try your luck.
RCD