Look at it this way: If you get a good machine with all parts intact and working order, it will outlast you. There's a wealth of information on this site on do it yourself service, repairs, and sources for replacement parts and attachments. I have never bought a vintage machine at those rock bottom prices that I've often read about. I have been had honest people I've purchased from & felt the craftsmanship of every old machine I've bought was well worth the $ spent. Is the guild sale a benefit for the group, or are the individuals the sellers. What I mean to ask is, "Is this a fundraiser for the group?" That also plays into what people are expected to pay.