First, try this useful guide can help you to find the comic book titles that most often benefit from comic book grading and comics appraisals!
Next, if you trust you have a valuable collection of books that should be graded and certified, you can visit the Certified Guaranty Company (CGC), whose president and head grader is Mark Haspe. On their website you can find their grading scale, fee schedule, the CGC submission form, or peruse the CGC Registry. They may also reholder your comic book, and do a restoration check to identify if the CGC holder has a Purple Label or a Blue Label.
A brief but wildly helpful tutorial may also be found on ComicConnect.com, which will help you identify not only the comic's title, but also its issue number. The smartest move is to contact ComicConnect.com to determine the market value of your comics before spending any money, and if you email them at firstname.lastname@example.org they will review a list of your collection and provide an accurate, professional appraisal.
MetropolisComics.com is also useful. When it comes to Golden Age, Silver Age and Bronze Age comics, they spend up to $5 million annually purchasing books, making them the largest buyer and seller of the vintage era. Comics published between 1930 and 1970 carry the greatest potential value, or those with an original cover price of 10 to 12 cents, so if you have a collection with books from the 1930s, 40s, 50s, 60s, or 70s, then they should definitely be your first call. They are always glad to point collectors toward smaller, trustworthy businesses even If they are not interested in the appraisal or consignment of your collection.
Lastly, PGX Comics is an alternative comic book grading service which encapsulates and grades comics for appraising. Their slabs often give buyers, sellers and dealers more confidence when buying a book because they act as a third party grading service, and they also charge lower rates than those of CGC.