Gearbest offers the Firefly 6S 4K WiFi Sports Action Camera in Black for $86.99 with free shipping. Features include a 0.65" LCD display, 16-megapixel camera, 140° wide-angle lens, microSD card slot, image stabilization, time-lapse photography function, slow motion, and video capture up to 4096x2160 (4K). Deal ends May 17.