Cafago offers this 4K Ultra HD WiFi Action Sports Camera in four colors (Yellow pictured) for $45.18. Coupon code "ZD3976MG" drops it to $33.98. (Be sure to select China Warehouse to get this deal.) With free shipping, that's $5 under our January mention, $25 off list, and the lowest total price we could find. Features include a 2" LCD, up to 4K video recording at 30fps, 16-megapixel CMOS sensor, 170° wide-angle lens, WiFi, microSD card slot, and housing that's waterproof up to 98 feet. It comes with multiple mounting options.
Note: This item ships from mainland China and may take two to six weeks to arrive.