Just wondering if anyone knows of sites (or people) that have accumulated price data that shows what the current valuation for Non TSR collectibles are

(Particularly White Wolf, WEG Star Wars or DCU, CoC, LUGs Dune RPG, SJG, etc.)

Was asking because I recently noticed a set of auctions on eBay for the Dune RPG where it looked like the price for the book of recent has stablized around $150 (with some deviation due to a glut in the market and a subsequent famine..)

My interest is just in determining fair value for the collectible and whether I am getting a bargain.

(And yes, I drooled over the MU Library Edition.. (still crying over it's price though..))