The Marvel comics library has grown huge, with tens of thousands of comic books published during the company's history. In celebration of San Diego Comic-Con starting tomorrow, Marvel has made it cost only $.01 to access a significant portion of the collection online.

For a penny, you can join Marvel Unlimited, the company's online subscription service, for a month. This will let you read over 15,000 Marvel comics digitally, including Spider-Man, The Avengers, and Daredevil, among others. Normally, a month costs $9.99. The service is available across PC and mobile devices.

To get the deal, enter code "Penny" at checkout. Your account will have auto-renewal active if you buy a month, so be sure to turn it off if you don't want to be charged full price later on. This offer runs from today until July 20.

Check back on GameSpot all of this week for more news coming out of Comic-Con.