Can I order an iPhone from the USA?

You can order unlocked iPhones from the USA, but they are expensive and you are almost always better off buying here in Australia. The USA iPhones are also different to the Australian iPhones in the 4G frequencey they work on.

Ordering other Apple products is highly dependent on the A$ rate and the internal rate Apple is using to price their items in Australia. Currently Apple's rate is around US$0.75, so unless the A$ goes over US$0.80 then it is not worth ordering from Apple USA.