Apple will adjust pricing based on currency. If the Australian currency is getting weaker it may be because the emerging markets that it depends on are seeing turmoil in their currencies because of the prospect of Fed QE tapering.
Apple has overcharged both in Australia and Europe for decades, even when the currency has been strong. It's simply because they believe that people who live there will stomach a larger price. It's probably true. It's still infuriating.
It results in funny cases where a Nexus 4 can be 1/3 the price of an iPhone 5.
Just fly up to Hong Kong over a holiday and buy an iPhone there. Prices are cheap, and its what we used to do in Mainland China before (now, iPhone pricing is about 20% higher than the USA sticker, which probably mostly due to VAT).