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Check out the Amazon section for Australia and see what is available there. If that satisfies you, then Amazon's Kindle is a good choice. That would be the easiest way, you can download directly to the Kindle but you pay 2 USD more per book than in the US. There is also the option to register the Kindle to a US account and pay US prices, but that forces you to use some tricks with your address and IP masking.
For the Sony you can buy at many stores (Waterstones, W.H. Smith, Kobo, BooksOnBoard, etc -- but for the American stores you often need to work around the regional restrictions). There even was a thread about Australian ebook stores some time ago. You can search for it.
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