The YI 4K Action Camera from Xiaomi, which was launched in China back in May this year, is currently available for pre-order in the United Sates. Amazon has the device listed on its website. As for price, the camera - which is available in black and white color options - carries a tag of $249. A bundle that includes the camera, a selfie stick, as well as a Bluetooth remote costs $279. Launch is set for July 12, which is tomorrow. Source
Source: http://www.gsmarena.com/xiaomis_yi_4k_action_camera_up_for_preorder_in_us_launching_tomorrow-news-19314.php