Don't forget to update your personal camera inventory
Photographica World:Photographica World is located in Berlin, Germany, and it both buys and sells used cameras equipment. It also offers free evaluations of cameras and an on-line price guide (in Euros).
Some of the price estimates, however, are off by a wide margin, especially with respect to newer cameras produced after 1995, and old, wooden ones. Be cautious when using these prices as a guideline.
Besides the store and estimated pricing guide, Photographica World has a virtual museum.
The best way to determine a decent price for a camera is to check eBay Collectible Cameras listings. Look for the "completed listings" checkbox on the left side in the "Show only" tab, click on it and search for the camera you need.
Also, please, check the information on How to read Collectiblend prices.