Hey bro im Aussie myself, i think its outragous when it comes to this but i have the solution.
You can get it for FREE.
All you need is a mate who has the season pass its a doownload thing as you would no.
If 1 of your mates have it ask if you can download there account onto your Xbox.
If you can great.
When you download it sign into his account go to Privacy Settings i beleive, and then Licence Transfers.
It may take a bit to load. once done press A when it tells you at the bottom of the screen to continue.
Then scroll down untill you find The Season Pass.
It will download to your account. Enjoy
Text me if it worked 0487391401