One card, millions of ways to enjoy it. Use the App Store & iTunes Gift Card to get apps, games, music, movies and TV shows. Available in a variety of denominations - spend it on in-app content, books, TV show subscriptions or even iCloud storage to secure files from all your Apple devices.
Anytime you can get a gift card for less than face value and free shipping on top, you go for it. So good, I used them for myself. Load them up in iTunes and don't worry about paying for music or apps for a while. Also pays for iTunes matching and iCloud.