Marvel already offers digital versions of its wares through a number of different channels, including Apple's iBooks, and it's now announced that it will be bundling a free digital copy with the physical purchase of many of its titles. Starting in June, all of the publisher's superhero comics priced at $3.99 — including the likes of Captain America, The Amazing Spider-Man, and The Avengers — will included a code that can be redeemed through the Marvel Comics iOS and Android apps for a download of the same issue. Marvel piloted a similar program with a small number of titles last year. The publisher has been slowly moving its entire catalog over to day-and-date digital availability — rival DC already made the move last year — but the promotion will likely help assuage the fears of comic store owners by offering the digital versions as a value-add to traditional purchases, rather than as just a direct replacement.