There are three ways to look up the price of comic books: online price guides, print price guides and auctions. Comic book rarity and desirability affect comic book prices.
Comic book price guides offer quick reference for many comic books. The industry-standard price guide is the Overstreet Comic Book Price Guide, which has been published since 1970. Many online retailers, such as Amazon.com, sell the Overstreet Comic Book Price Guide. The Overstreet Comic Book Price Guide is over a thousand pages long, and collectors consider it reliable and comprehensive.
There are also many online comic book pricing websites, such as ComicBookRealm.com and ComicsPriceGuide.com. Most comic book pricing websites allow searches by publisher, title and issue number, and some also list current auctions for specific comic book issues.
Auctions, both in-person and online at websites such as eBay.com, also provide a good source for comic book prices. Auction prices may be more current than those listed in price guides as they reflect current market conditions. However, auction prices fluctuate on a variety of factors, including the number of people aware of the auction.
Not all old comics sell for high prices. Old comic books with large print runs and little demand do not fetch high prices, whereas newer comic books with small print runs and a large number of interested buyers may fetch much higher prices.