Ace Teah via Amazon offers its Ace Teah Waterproof Universal Phone Case 5-Pack in Assorted Colors for $13.99. Coupon code "BQZGRJRK" cuts it to $12.99. Plus, Prime members bag free shipping. That's $19 off list and the lowest price we've seen. These cases fit phones up to 5.7" and are IPX8-certified waterproof up to 49 feet.