If you were really determined to buy it outside Aus I suppose you could buy an iTunes gift card from here and then login to iTunes via an Aussie proxy. Happens surprisingly often in the other direction.

You really would be paying the 'gold price' too as the $AUD is pretty strong due to the price of gold and other commodities mined here.

Season 2 is available up to episode 9 as a season pass for AUD28.99