Marvel offers Marvel Insider members its Marvel Digital Comics Bundle for free. (Apply coupon code "COMICDAY" to see the bundle. Not a member? It's free to sign up.) That's $20 under what you'd pay at Comixology. The bundle includes All New Ghost Rider #1, Dr Strange #1, Moon Girl and Devil Dinosaur #1, Powerman and Iron Fist #1, and Black Panther #1.