US customers interested in the Nokia 6 were able to acquire the black variant for a few weeks already, but it took a while for the silver color option to become available. This variant has the same prices are the black Nokia 6, also coming exclusively via Amazon, with or without ads.
In addition to the black and silver Nokia 6, a blue and a copper variant should hit the market next month as well. The price is $229 USD without any offers or US$179.99 for the ad-supported version (the customer gets to pay US$229.99, but receives a US$50 Amazon.com Gift Card). Shipments are expected to begin "within 1 to 3 weeks" for the standard version, while the one with ads will be unleashed on August 18.
As you probably knew already, the Nokia 6 comes unlocked. Unfortunately, it only has partial 4G LTE support on AT&T, while T-Mobile customers can fully enjoy the benefits of the carrier's 4G network.