The LG G6+ is now available to purchase in the United States. Its not officially imported though - Amazon has the international variant listed on its website for $699. Available color options include gold and blue.

It's worth mentioning that the device listed on the retailer's website only supports GSM carriers (AT&T, T-Mobile), and doesn't come with a US warranty.
The LG G6+ was launched last month, and is currently officially only available in the company's home country of South Korea, where it carries a price tag of around $840.
It differs from the standard G6 in terms of storage (128GB) and color options. In addition, the handset also comes with B&O headphones in the box and wireless charging support.
Source | Via