Scammers will use any means they can think of to try and persuade people to give up personal information, so it's unsurprising that iTunes gift cards have become a target. A phishing message doing the rounds claims to offer a $100 gift card for $9, but it's nothing more than another attempt to steal your credit card details and other personal information.
There are plenty of indications that this message is dodgy (apart from the fact I'm not a long-term Apple customer and I've found five different variants in my spam folder). The awkward phrasing, the reference to Apple Inc (rather than Apple Pty Ltd, the local entity) and the fact that the link doesn't go to an Apple site all give it away. As ever, if it sounds too good to be true, it will be.