Hey
Being a fellow Aussie, I've had the same problem. but I've found a site called
www.casefresh.com its an Aussie site, and its a lot cheaper than importing, or even buying off the shelf here. And they have free shipping for orders over AU$80
They are only up to wave two at the moment (which is all Aus has gotten so far) I've bought from them, and I reccommend them
Hope that helped