The listing is for for Steam codes which work for PC users as well. When you go to the checkout (which asks nosy questions), make sure you change the currency to OZ dollars.
The bundle contains:
BioShock Infinite base game
Columbia’s Finest DLC Pack (not included in Season pass)
BioShock Infinite Season Pass
The Season Pass itself is just $5, and Columbia's Finest $1.25. The game has a 25% markup/Australia tax on Steam, so this is probably as low as you will be able to pick it up over the next 12 months.
I also noticed a bundle of 2 Cultures games on sale for $2 (75% off) on Steam: http://store.steampowered.com/sub/63734
It isn't worth creating a new listing for, since they aren't too many people interested in games over 5 years old.
This is actually $8 AUD too…GameAgent kindly do a 1 to 1 conversion :)