Last i checked prices vary due to country's taxes...The retailer in Australia has to get the games from the publisher...make a profit off them..pay the publisher there share...and then the consumer has to pay taxes on top of that....Steam is somewat the same way..even with it being online...country's taxes are still added into it and then given to your country which you bought it in...How that 1 USD equals to 1 euro perfectly is beyond me on there however.