If you find an item in the iTunes Store that you'd like to save for later, you can add it to your Wish List to preview, buy, and download at another time.
To add an item to your Wish List, click the arrow to the right of the item’s Buy button and choose “Add to Wish List” from the menu that appears. You can add music, movies, TV shows, and apps.
To see your Wish List, click the arrow to the right of your account name and choose Wish List from the menu that appears, or click My Wish List under Quick Links on the iTunes Store homepage.
Any items saved in your Shopping Cart in previous versions of iTunes can now be found in your Wish List.