Why is the iPhone 4s way more expensive in Australia?

I'm thinking of buying an iPhone 4s from Australia but I don't want to pay $600 more than I have to. Why is the iPhone cheaper in America? And can I get one off the American apple store and use it in australia? Any help would be great!

Because it ships to the US way cheaper than australia. +san jose ca is where apple is located

Thats because In america you can buy it according to there cell phone plan, through AT&T, Sprint, and Verizon Starting at $199* but in australia i think there are no cellphone plans like that if you have you also can buy it for that price, but you can't buy it for 199 in america and use in in austrlia because that sim is working only on that country if you want it to work in australia you need to buy a factory unlock 1 and its expensive.