You don't mention your platform, but I am assuming you mean a console version of the game.
In the UK the prices are usually higher than the USA, as games priced in US$ are often more or less converted 1 to 1 to Pounds. This is very annoying where US$100 = £100, when it should be ion the region of £66 - £72.
However, I believe things may be worse in Australia and New Zealand.
One of the cheapest shops in the UK is shopto.net, and they do deliver internationally, but look at their UK prices, and it would appear that you may be better off in Australia at the price you quote above
Classic Edition - PS3 & XBox = £54.85
Standard Edition - PS3 & XBox = £37.85
Traditionally PC prices have always been cheaper, perhaps because companies like to rip-off their more popular console platforms, and partly because Microsoft & Sony want their cut of the action, and have to test every bit of software installed on their platforms, and charge an arm and a leg for the privilege.
For the PC, the Standard Edition is the ONLY one available on disk, and will have to be upgraded with Classic Edition DLC via Steam.
So the PC Standard disk version @ shopto.net is £19.85
The final choice will be Steam itself for the PC version(s) of the game. Steam maybe a reliable platform, but they are not known for their competitive pricing, to me they tend to be over-priced, especially for new release. Even if they give 10% discount for pre-orders, they are still over-priced. They however have great sales, weekend deals, and mid-week deals, but you will not get a new release in these sales.
Steam have not posted their pre-order prices yet, but they will be close to doing it. It is done up to 6 weeks before release, and we are close to moving into that window now.
There has also been no mention of whether the PC Classic Edition will be available on day one as a complete package or as a pre-order. Rather than buying or pre-ordering the Standard Edition, then upgrading via DLC to Classic
Sorry for the long reply, but the upshot is that your Australian price is good if you are referring to the console Classic version, equal if it's the console Standard version, but bad if it's the Standard PC version.
Cheers
F1 2013 @ Shopto.net