they cost about 20 AU dollars
Because, in most cases, it costs the developers money to produce them.
like $2 or $3
No.
yes they are
no.
iPhones without a contract typically price for around $649 USD for the 16 gb version all the way to $849 USD for the 64 gb version.
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We do not know how much the iPhone 5 will cost. It will probably vary based on the provider and your service plan. Judging by the average price of iPhones at their initial release it may cost 700-800 US dollars for one without a service plan.
It cost infinite.