They can go for a boatload on eBay. There is a guy who has some in Brooklyn and he was hitting $2000 for them a few months ago but they were quite old. I don't really think they are worth that but you know how eBay is....you just mention "Cinelli" and "SLX" in the listing and it gets nuts. I will see if I can track down his seller name...

edit: now that I can see your photos, the guy in Brooklyn was selling older Cinelli frames, likely from the '80s. Anywho, here is one of his auctions for a similar frame to yours and it ended at $1230 with BIN. It may have gone for more as there were 5 bids before the BIN was taken: http://cgi.ebay.com/ws/eBayISAPI.dll...m=120225774738

Check out his feedback and you can see that he sold the ones I mentioned for a lot of cash, one hit $3100, if I recall correctly.