Ebay is still the largest auction site out there. They are hugely profitable and popular. Their tag line is, "You can find it on ebay." And when they say that, they mean it. With so many auctions to choose from, your bound to find just the perfect item for your collection as well as being able to sell your comic with such a large user base. They have had problems lately and have tried to make things easier for buyers by changing their feedback structure, but their rising fees may make them lose their top spot.
Comic Connect has made some big splashes in the comic auction market lately with the record breaking sales of comics like a 8.5 CGC Action Comics #1 which sold for 1.5 million dollars. They are primarily a seller of silver and gold age comics and have tens of thousands of comics to choose from. The owners and operators of Comic Connect also boast some great stats with their CEO, Stephen Fisher having created the 10 point grading scale for comics and their COO, Vincent Zurzolo, having founded the Big Apple Comic-Con. These are people that live and breath comic books and their site is a great one to find treasured comics.
Heritage is one of the larger and better known specialty comic book auction sites. They specialize in rare comics and will either buy your comics to sell or they will work on a consignment basis. This means that you go to them with your collection and they offer it up for sale to their members. They do take a cut of the final sale, which varies from case to case, but usually starts at about 15%. One really great thing about Heritage Auctions is that they will allow you to put together a "Wants List", of comics you are looking for. When one comes available, they will let you know. That's going the extra mile.
Amazon.com is making a play against eBay to become the premier sellers destination. They have a complete different fee structure that only charges you if your item sells, which is becoming much more attractive for sellers the world over. Amazon.com still has more graphic novels than floppies, but they are starting to become more common. If sellers become less satisfied with eBay then Amazon.com stands to be a major player and could easily surpass eBay's hold on the comic auction market.
What started as a stamp auction site has evolved into a collectibles site as well. They boast almost a hundred thousand comic book auctions that range from the Golden Age to the Modern Age and everything in between. BidStart is touted as something that, "...stands out in the industry with its unparalleled personal attention and low selling fees, boasting over two million collectible listings at any one time." It is a great place for collectors as it is not only an auction site, but, "...a community based on knowledge and respect for the industry, rather than a business solely built for profit." Check it out and see if you agree.
6. Comic Link
Comic Link specializes in selling comic books and comic book art. It is run by experts and enthusiasts in the comic book field. Like Heritage, they offer a want list feature for buyers to match them up with sellers. They also offer consulting to people looking to invest in comic books by buying rare comics that will go up in value over time. They also have a large range of CGC graded comics, comic books that have been graded by the CGC company, guaranteeing the condition of the comic.
Hakes specializes in older and vintage comic books but also has a large collectible base as well. Their main page has hundreds of categories showing how many auctions are going on at that time. This makes it really easy to find just what you are looking for. If there is something related to comics and is of vintage age you just might find it here.
The Pacific Comic Exchange touts itself as, "...the largest computerized online comic book trading company specializing in Golden and Silver Age comics from 1933-1969." The nice thing about PCEI is that they take your comic book, grade it themselves, and then list it with your asking price. They put a lot of personal touch into their business. Owner Robert Roter is a self proclaimed comic book enthusiast and it shows in PCEI's hands on philosophy.
9. Foo Comics
Foo Comics is a newer subscription and auction site where you can sell your collection or set up shop online. Their fees aren't bad, with their listing and closing fees similar to eBay but overall seem less. If you are looking for a fresh start from eBay this could be the place for you.