Moto G4 Plus now (unofficially) available in the US via Amazon
Right now, the Moto G4 Plus is offered for $339.99, and you can get it in either black, or white. Mind you, this is the Moto G4 Plus with 2 GB of RAM and 16 GB of (expandable) storage space, and we assume that the $339.99 price is a bit higher than the one that Motorola will ask once it officially releases the phone. Anyhow, the handset is sold unlocked, and will work on GSM/LTE carriers like AT&T and T-Mobile, but not on CDMA/LTE carriers like Verizon, Sprint, or US Cellular.
Update: There's no need to buy this Moto G4 Plus from Amazon, as Motorola is now officially taking pre-orders for the handset, starting at $249.
If you want to, you can also order the Moto G4 via Amazon (for $279.99). However, this particular model doesn't support US LTE, so it's not worth buying. You'd better just wait for the official release.
While the Moto G4 Plus and G4 are largely the same, the Plus offers some extra features, including a fingerprint scanner, and a superior rear camera (16 MP with laser and phase detection auto focus). You can find out more about these new Motorola smartphones by checking out our Moto G4 Plus vs. Moto G4 vs. Moto G4 Play comparison.
source: Amazon (Moto G4 Plus, Moto G4)