Online price guides for Marvel comics can be found on ComicsPriceGuide.com and SellMyComicBooks.com. In addition, print price guides are released at regular intervals and may be found in comic book shops and bookstores.
Comic book price guides list the estimated resale value of both classic and newer comic books. They are an important resource for collectors looking to sell their collection or appraise their comics for insurance purposes. Price guides are updated regularly, and new additions come out monthly, quarterly or yearly depending on the publisher. Since prices can change over time, it is a good idea to have the most recent price guide before beginning to appraise a collection.