All the websites that I know of that list Baseball card prices charge a fee. eBay is a good place to price your baseball cards for free. The prices paid by collectors are the basis for all price guides. They accumulate data over a period of time to come up with a value. You could do the same.
Do a "completed listings search" on eBay for the baseball cards you are checking prices for, and save it. You need to be a registered member to do this, but its free, quick to sign up, and have no obligation. After you save the search you can use it to search for other cards.
When checking prices take note of the condition of the card that sold for auction, as compared to yours. This is very important. Try to base the value on a number of auctions, and average out the prices. Omit prices that seem to be very high or low as compared to most results. This should give you at least a ballpark figure on value.
Prices for new, and hot cards are often inflated because of the "I gotta have one" factor. In time prices for these cards will level out as most collectors have the card in their collection, and the demand dies down. WikiAnswers is also a good place to find baseball card values. When asking for a price on a baseball card include the year issued, the company that issued the card, the player, and card number.
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rookiestars.com has a totally free online sports card price guide. It has 1000's of cards listed for baseball, Basketball, football and hockey.
The most complete baseball card price book would be the 2008 Standard Catalog Of Baseball Cards. You can also get the beckett guide but its limited to the number of cards it list.
There is no good free baseball card price guide.
Go spend five dollars and buy a Beckett Price Guide and get professional values complete with a condition guide too.