If you want a Sony I would go to B&H Photo (they will ship to Oz)., and compare with what you can get on ebay.
They are cheaper than
Most of the ebay seller's normal prices.
That being said I just won a new PRS-900 on ebay for a little less than B&H.
Take care to look at ebay
NOT Australia (the US sellers that load on the Oz page want a good 10% more than B&H)
Good luck.