Amazon offers over 23,000 Marvel digital comics for Kindle, with prices starting from free. That's the first such offer we've seen for comics on Kindle in two years, and it yields price lows on a wide range of issues. Featured franchises include Avengers, Guardians of the Galaxy, Star Wars, Captain America, X-Men, and Spider-Man.

Note: Graphic novels start at 80 cents $1.99.