The Xperia XZ by Sony was launched in October 2016. Its successor phone namely Xperia XZ1 is also out in the market. Hence, it is a common-sense thing that price of Xperia XZ will decline. Currently, Amazon and B&H are selling this phone for the lowest price in the USA.
The starting price of this phone previous year was $699.99, whereas now it stands at even less than half of that price. The actual price now on B&H and Amazon is in fact $314.99. It is basically under a deal offered by the above-mentioned retailers, so it is still not known till when this deal will be applicable.
Therefore, if you don’t mind having a year-old smartphone, i.e. Sony Xperia XZ, then this will be the best deal for you for such a low price. However, this phone is in unlocked condition, and it will only work with GSM carriers, i.e. T-Mobile and Verizon etc. However, this phone will not be supporting the carriers such as Sprint and Verizon etc.