Q: Can i buy itunes gift cards and delivered online?

Q-1 : Can I buy itunes gift cards and delivered online?

Q-2 : i have a laptop macbook air. I use parallel desktop 7 on it to operate both mac and windows 7 at the same time. I recognize that the battery life is very short when iam using windows applications. Whearse if iam using mac system the battery life is as per the specs (7hrs approximately).can anbody explain the reason?

Thx