I just noticed this "search" feature on eBay. Must have been around for a long time, but I first spotted it today. You can list any product, and eBay will tell you the average price it went for, over a 7-day period, in a likely selling category.

Go here to play around with it:
http://cgi5.ebay.com/ws/eBayISAPI.dll?MfcISAPICommand=SellHub3

Here are some valuations I just got there:

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Robert
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Mario Adorf (dark hair), Denholm Elliott and Peter Van Eyck (from left to center) in a poker game for high stakes sets the mood of tension in "Station Six Sahara" (1962).

"A beautiful blonde (Carroll Baker) joins a small group of men running an oil station in the Sahara Desert and starts the emotions soaring," per IMDb.
http://www.antiquegamblingchips.com/StillsB_OtherMaleActors.htm