Can you buy music gift cards from the Apple Itunes store online?

Yes of course you can. Once you register and activate the VIsa prepaid card, you can use it anywhere that you want online. Most sites online have PayPal as the method of pay which is good because it is reliable and secure. And also you can purchase using the giftcard using PayPal as a "debit card". I get mine from a reliable source that I found on google at itunes-giftcards.com/iTunes_match.html. And I in addition to getting the Visa prepaid, I get my iTunes cards there as well.