USA vs Europe, prices

Living in a small balkans country, I am used to having to pay a hefty premium on pretty much everything. But just yesterday I saw that one online retailer here is selling Samsung smart PC 500 for 1400$. 700 with a dock is 1200$ in USA.

I could basically buy an airplane ticket, go on a trip to USA and break even.

So I'm just wondering what exactly is the reason for this USA -> Europe price difference