HDC Galaxys S5

I got a HDC Galaxys S5,a Samsung Galaxy S5 Replica, from http://www.hdc-mobile.com/index.php?...product_id=56, 
It works so far so good. However,I found that many sellers are selling this model,
the price I paid for is not the lowest (not the highest as well), any one knows
where to buy the cheapest one? Frankly, http://www.hdc-mobile.com has integrity, I confess this, they 
don't hide anything, and they tell you all truth. Anyway, any one knows
where to buy the cheapest one?