Which US Apple stores accept iTunes Gift Cards?
You can use redeemed value from an iTunes gift card to buy from the following stores:
- iTunes music, movie and TV stores for iOS, Windows and Mac
- iBookstore on iOS
- App Store on iOS
- App Store on Mac OS
The only gift cards that are accepted at an Apple Retail Store are Apple gift cards. The Apple Retail Stores and the Apple Store online do not accept iTunes gift cards as forms of payment.
You can not use redeemed value from an iTunes gift card to buy an Apple gift card or anything else from the following stores:
- Apple Retail Stores
- Apple Store on the internet at http://store.apple.com
- iCloud yearly storage space increases
- iTunes Match service
The front side is actually irrelevant for the card. If you buy any iTunes gift card for and with US dollars, you can redeem it with any US Apple ID.
It will at least work with the Music store, iOS App Store, Mac App Store, and iBookstore.
(I've been using those cards ever since, since I don't have a credit card.)
You can use up to 8 Apple Gift cards (not iTunes Gift cards) at once to pay for your purchase at an Apple Retail Store, according to the the Apple website. (I don't know about the Apple Store app or the online store, since I don't live in the US.)