From Marvel.com…
Marvel is proud to announce that, beginning June 2012, all Marvel super hero comics priced at $3.99 will include codes for free digital copies of those same issues on the Marvel Comics app for iOS and Android devices at no extra cost! That’s right, the most-talked-about comics in the industry—including AVENGERS, CAPTAIN AMERICA, INVINCIBLE IRON MAN, THE MIGHTY THOR, AMAZING SPIDER-MAN, WOLVERINE & THE X-MEN and more—will come packed with a code to ensure fans have the most critically acclaimed stories with them anytime, anywhere.