TabletExpress via Amazon offers the Dragon Touch Vision 3 4K WiFi Action Camera for $69.99. Coupon code "HNBQ7623" cuts the price to $55.99. With free shipping, that's $44 off list and the lowest total price we could find. It features 4K recording at 30 fps, 16-megapixel photos, WiFi, and a waterproof case.