How much does Marvel cost us?
Marvel is now free for use in both development and production (it used to be free for dev, but cost money for production. That changed with the 2.0 release)
What about Found users, can they use Marvel for free, without the premium account?
Just asked the Found team. They said that yes, Marvel will be free for Found users even without Premium. But not yet, because they haven't implemented it yet. Soo...soon =)