So I have a number of rare/unusual items that I've been thinking about parting with. The problem is that (as far as I've been able to find out), there's no real way to figure out what they're worth. They don't come up on eBay and I don't see them anywhere else on the web. How does one figure out what something is worth? For example, I have a screen used Spider-Man boot worn by Toby McGuire. They never come up on eBay and the only other thing that I've found on the net that comes close is a pair of boots that sold for $18,000. I suppose that I could just divide that in half, but the pair was the classic red boot, and mine is the black "symbiote" boot. Does the symbiote style make it more valuable (since it was only used in one movie vs three movies for the red) or does it make it less valuable? Is there any way to tell what a reasonable price is for items that aren't mass produced (ie. Side Show, Master Replicas, Icons, etc.)?