Cafago offers the Andoer Q3H 4K Ultra HD WiFi Action Camera in Black for $42.38. Coupon code "ZD3144BUS" cuts that to $31. With free shipping, that's $8 below our April mention and the lowest price we've seen. (It's the best deal now by $9.) Features include a 2" LCD, up to 4K video recording at 25fps, 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: The countdown timer on the product page does not reflect an actual expiration time and resets daily.