Free baseball price guides can be found online on websites such as Professional Sports Authenticator, GMA Grading, SportsCardDataBase and Vintage Card Prices. Each website features different methods of searching, from browsing through sets to advanced eBay searches. PSA notes that prices on its website reflect dealer prices from PSA-certified collectibles.
PSA lists baseball card values by set dating back to 1887. Prices are further broken down by common cards and then specific players in the set. Different manufacturers and multiple sets per year have price guides with various conditions. Newer sets list pricing for only mint or near-mint conditions, whereas older baseball cards have prices for good condition and better.
GMA Grading offers a keyword search for price information. More specific searches get better results. General searches are good for overall player collections. SportsCardDataBase includes a keyword search in addition to a free subscription service. Subscribers have access to the website's deal finder and real-time prices. Vintage Card Prices offers searches for cards are based upon keyword, player last name, set name, ACC number and card type.
A baseball card's value is based upon rarity, condition and how much someone is willing to pay for it. High-end collectors get cards graded by professional grading companies before a sale. Recent online sales of a similar card give buyers and sellers an idea of a card's current worth.