FORCE
Basically this let's you read every Marvel comic older than 6 months. They also have reading lists so if you don't know where to start, they can guide you.
The coupon code is inspired by the 900+ star wars related comics.
Warning; This deal contains Auto-renewal so you must unsubscribe before the new year if you don't wish to be billed. The do this you have to Email Customer support by 5pm on the last day of the free month. We site isn't explicit as to whether that mean this month Dec 2015 or a 30 days after subscribing, seeing the deal started on the 11th to later seems more likely.
Online account, content can be viewed on PC, Android and iOS
Content may not be used, downloaded or otherwise exported into Cuba, Libya, North Korea, Iran, Syria, or any other country to which the U.S. has embargoed goods.
You can cancel by accessing "my account" also. I'd say that would be a lot easier than emailing them.
The T&C's also says "YOU CAN CANCEL ANY TIME AFTER YOU HAVE SIGNED UP, BUT YOU WILL CONTINUE TO HAVE MEMBER ACCESS AND BE CHARGED THROUGH THE END OF YOUR SUBSCRIPTION TERM, AT WHICH TIME YOU WILL NOT BE BILLED AGAIN.". So that suggests you can cancel immediately and your subsciption will continue for the 30 days.