Everything is expensive in Aussieland. This is nothing new and SE is not the only one who doesn't make it easy to ship there.

Try buying games that don't come out in your region- you have to pay a premium- often twice as much. I'm hoping Monster Hunter 3G comes out in the US, because if it doesn't the only way for me to play it would be to import a JP 3DS and the game which would cost literally twice as much as an NA one.