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Charlie O'NealBob, I'm with you this does sound like a great idea especailly if you are buying cards as an investment. It sounds like you would just enter the cards you own and it will give you a price of what the card is going for in the real market. Kinda like your stock portfolio of basball cards, at least that's the way I am thinking that it is being described.
I was typing this when card pricer responded. He answered the question I had about rarety though.