Yes, you can. All you have to do is download iTunes, and click redeem. Then you start buying songs, videos, or apps.
You can find them at a place like vons or abrestsons or stores like walmart or target!
You can get itunes giftcards from any music store, electronic store, walmart, target, and i think even gas stations now. Hope this helped! :)
no
The highest amount of money a single Itunes gift card in the US costs is $100.Source: http://store.apple.com/us/browse/home/giftcards/itunes/galleryAspie1987
If you email apple they will probably be able to help apple.com/support/itunes/contact.html?form=account&topic=iTunes%20Store%20Account%20and%20Billing&subtopic=Managing%20your%20Account
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No, you can't get money on iTunes. However, a friend of yours could give you a gift card which you could redeem in iTunes. There are also a few sites that can give you iTunes giftcards, like PrizeRebel. They will send you gift cards in return of visiting their sponsors web site etc.
B
Just Amazon Gift Cards, I believe.
No, you can use them on everything but Stamps and Giftcards.
You can use walmart giftcards at walmart, that's it