Beckett magazine comes out monthly and lists baseball cards and their market price, and is the industry standard for getting an estimate on a card. You can get this at pretty much any sports memorabilia store.
The absolute best way, though, is to just look it up on ebay under "closed items". Chances are your card or one exactly like it has been sold, and since this is where most people go to get the best deal on cards, it will give you a great indication of what people are willing to spend.
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