My business is all about finding old comic book collections that people sell due to various reasons, offer them a good deal for both of us, and then I resell the special comic books to my clients, most of which are comic book collectors or die hard fans of certain titles or characters.
I recently bought a collection comprised of 2,000 comics and it's been complicated to sort them out, organize them by letter and number to know exactly what I bought and which issues (numbers) are good.
