The HTC U Ultra smartphone isn't due to start shipping in the US until next week, but there's a seller on eBay that has the dual SIM model available for sale already. And it's actually about $113 off of the price that HTC is charging. This model will work here in the US, but it's not an official US branded model. It is a dual-SIM smartphone, so you can pop in two SIM cards and use whichever you like.
HTC's U Ultra is their newest flagship smartphone. It was announced back in January, shortly after CES in Las Vegas. This is part of their new branding, dropping the "One" brand for the "U". The HTC U Ultra has a massive 5.7-inch Quad HD display, it is also powered by the Qualcomm Snapdragon 821 processor with 4GB of RAM and 64GB of storage. HTC has gone and made the device with a glass back and a metal frame. The glass back is very reflective, and does definitely attract plenty of fingerprints, as you'd expect. It's a great looking device, and possibly the best smartphone HTC has built to date.
You can grab the HTC U Ultra from the link below. At this time, two of the four colors are sold out, so it likely won't last long. Right now the black and pink colors are still available.
Update: The original model we had linked here has sold out. However, another eBay seller is now selling the Dual SIM HTC U Ultra for a slightly higher price of $669.