they routinly go for at least 500 and a mint one Ican believe 711. good luck David
I picked up a used one in mint condition for under $500 a few months ago - I think the original selling price was about $300. The selling prices on the rarer Contax 645 items, like the waist level viewfinder are quite high while lenses and camera kits (body, prism, 80 and film back) are selling at half to 2/3rd of the original price. Prices on eBay are more volatile than the summer stock market. In fact, I saw one WL finder go for $1100 and another for $200+, (it had a damaged magnifying element) so it just depends on who is watching when you post it. Why don't you post a list here on LL?