YI Discovery 4K Action Camera for $50 w/free S&H [add waterproof case for +$20]

Never a dull moment with YI cameras. The new condition YI Discovery 4K Action Camera is currently going for $53 with free shipping at Amazon. Not a lightning deal. It also has a $3 off clip-on coupon, making it $50. This is sold by a 3rd-party seller (not YI) with the order fulfilled by Amazon (Prime eligible).

Optionally, if you buy the camera together with the Waterproof case, you will get 50% off the price of the waterproof case as a combined purchase discount (drops from $40 to $20). Both must by purchased from the same seller for the 50% off waterproof case coupon to activate.