COMC (Check Out My Cards) is a prominent online marketplace for trading cards, including sports cards, gaming cards, and comics. Founded in 2005 and based in Redmond, Washington, COMC leverages advanced technology to enhance the card collecting experience. The company operates the largest consignment service in the collectibles industry, with over 40 million active trading cards listed on its platform.

COMC provides a range of services, including a consignment service where collectors can send their cards for scanning, listing, and shipping. Buyers can explore millions of individually scanned cards and benefit from a unique shipping feature that allows them to purchase from multiple sellers with a single flat shipping fee. Additionally, COMC offers card grading services and facilitates sales on eBay, catering to a diverse customer base of hobbyists worldwide. The company's mission is to simplify the buying and selling process, making it a reliable and enjoyable platform for collectors.