Tomtop offers the Andoer Q3H 2" 4K Ultra-HD LCD WiFi Action Camera in
seven six colors (White pictured) for $39.99. Coupon code "D3144US" drops it to $34.99. With $4.95 for shipping, that's $83 off list and the lowest total price we could find. It features a 3840x2160 resolution (2160p), 25fps, 16-megapixel CMOS sensor, 2" LCD screen, 170° wide-angle lens, WiFi, and waterproof housing.