I would not recommend buying iTunes gift cards from EBay. There are a few spoiled apples (no pun intended) that are out to con you by sending stolen gift card codes.
Always get these from reputable stores like Best Buy, Walgreens, Safeway, etc.
I happen to buy a stolen gift card that resulted in my account being frozen, and took several days to resolve w/ Apple. Don't want this to happen to anyone.