Bike prices

Does anyone know any websites that would tell me a fair value for bikes, both new and used?

bikepedia.com gives the original MSRP for most models. Finding current day value takes a little guesswork. Searching ebay for recently completed auctions of similar bikes (year, component level, condition) gives an idea of what a bike is worth to work from.

We need a kelly blue book for bikes.

Thanks...indeed we do need a bicycle kelly blue book!