Where to buy iPhone 5?

Hello,
I first want to apologize if I am posting this in a wrong section.

So, I live in Europe - Bulgaria. Here iPhone 5 costs 1200 USD which is twice than what it costs in the US apple store. My question is, do you know from where I can get new factory unlocked iphone 5 which at the price of up to 700 USD like the price in the USA store?

Thank you! Happy new year.