Check Out My Cards (COMC) is a trading card marketplace that operates a bit differently. You send them your cards and they’ll identify and store them, scanning images for display on the site, assigning them to your account. You can then buy and sell those cards on the platform. When you’ve made some deals to get different cards that you want, you can then have those packaged and shipped to you.
COMC has been around since 2005, with their offices in Washington state. They have facilities in both the United States and Canada, which is great for collectors north of the border. You can send cards in without having to deal with potential customs issues.
The platform allows you to deal in both sports cards and trading card games. They also have partnerships with Upper Deck‘s e-Pack format to send cards directly to your COMC account, and both PSA and CGC to submit your cards for grading without having to ship them to yourself in between.