Yi Technology via Amazon offers its Yi 4K Action Camera in Night Black for $199.99. Coupon code "YISPROFF" cuts it to $169.99. Even better, free shipping applies. It features up to 4K video recording at 30fps, 12-megapixel still shots, 2.19" LCD touchscreen, seven layers of glass lenses, Sony IMX377 image sensor, and dual-band WiFi. Deal ends June 30.