Cafago offers the Andoer AN4000 4K WiFi Waterproof Action Camera in several colors (Black pictured) for $42.95. Coupon code "D4619YD" cuts it to $36.83. With free shipping, that's the lowest price we could find by $11, although we saw it for $3 less in May. Features include a 2" LCD, up to 4K video recording at 30fps, 16-megapixel photo resolution, 170° wide-angle lens, WiFi, USB, SD card slot, rechargeable battery, housing that's waterproof up to 131 feet, and remote control. It comes with multiple mounting options.

Note: This item ships from China, although an estimate of one to two weeks for arrival is given. (Shipping time may be longer than indicated.)