The PH-1 is currently available on Amazon for US$400. This is the lowest the device has been officially sold at since it was launched but it's already a last-gen flagship for the most part, so it really shouldn't come as a surprise. The deal is available on both Amazon and Best Buy.
https://www.notebookcheck.net/The-Essential-PH-1-sees-a-price-slash-to-400.290672.0.html