Remember that Australian prices include 10% GST which the US prices won't have. Similarly, the UK will probably have 17.5% (I think) VAT. Still much pricier, but a shade less so.
At least there's the pseudo-excuse for the increased price of actually shipping physical goods, as opposed to the argument for digital downloads which is "Hey, look over there! scamper"
Average Brick Price
So yes, the price is almost double in Australia what it is in the US.Average Licenced Brick Price
If the link works, you can see all my numbers on my Facebook page: http://rick.ph/lego_price_analysis