Currently it is not avaliabe in the Australian iTunes Store.
They only recently began to rollout the new iTunes cards (they have an iTunes logo as the card face + difference colours for different credit values).
From my understanding, they are preparing this feature for the Australian store, but aren't quite ready yet. Once Apple is certain that a majority of all iTunes cards being bought are the new type - the feature is sure to be released.
Key features of the new iTunes cards:
- New card face (hologram iTunes logo)
- New card base (solid cardboard - no longer flimsy)
- The code label is peelable! No more excessive sticky annoying material!
- A square that surrounds the code (used in this camera-detection feature)
As Apple mentions here - Not all country support the feature, but I believe it is coming soon
Hope that help! Have a lovely day!