Kindle retailing remains weird. Dick Smith has an Australian physical store exclusive on the Kindle Touch, which it is selling in-store for $185. But if you order it from Amazon directly, you'll pay $149 including postage. I know what I'd do.
The 3G version is $249 from Dick Smith, and that makes more sense, as Amazon won't sell that model to you directly at an Australian address. But the Australia tax for the standard version (a deal Dick Smith has until April 2012) seems unnecessary to me, unless you need an emergency gift. But if you're tempted for some reason, here's the pricing table for Dick Smith: