Sony has tried more than once to wedge themselves into the North American smartphone market, but often to no avail. Perhaps in an effort to clear stock for their recently-released Xperia XZ and X Compact, Sony is now offering the Xperia X for $399 on Amazon.
Even at that price, I'm not sure I would recommend this phone. If you read our review of the device, you'll know that it didn't impress us. While the display, front-facing speakers, and battery life are excellent, it is not water resistant, lacks a fingerprint sensor, and has a lackluster camera. The phone is powered by a Snapdragon 650 CPU with 3GB of RAM, and has 32GB of internal storage with a microSD card slot.
If you really, really want an Xperia X, this is the best price we have seen it at. The black color is $399, the Lime Gold is $422, and White and Rose Gold are $424.
Now all four colors are between $388-389. If you are thinking about purchasing, I would do it quickly, as there aren't many left in stock for all colors.