In which country one can buy the cheapest Iphone?

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Hey guyz, I live in India , here the price of Iphone is about $540 or Rs.26000 ( Indian Rupees) , here it seems to be very high priced gadget. The price of Iphone and other gadgets that are imported are generally of very high price because the import duty charges imposed on importing those goods makes the overall price of Iphones and other gadgets high. So I just want to know where can one get the ceapest Iphone and at what price ( I mean the country and price of the Iphone in USD ) , So that I tell my friend to purchase it from there and send it to me !!!