This is interesting to me. I haven't got got it figured out yet but have heard people mention finding estate sales on line. I live in a small town and check the paper for yard sales and estate sales. "Estate sales" generally are larger and there is a better chance of finding a machine with all the goodies. Sometimes "estate sales" are hosted by companies that do that sort of thing, but sometimes it's just a phrase people use in their ad and can be misleading. I chased after one this week that said "estate" in the paper, and then "yard sale" in their driveway but it panned out well with a Necchi in a cabinet.
I'm going to check the link Mark, and see if their are any on-line sales in this area. Is it a sometimes there are and sometimes there aren't type thing??