Ace Teah via Amazon offers its Ace Teah 5.5" Sports Armband Phone Case in Sports Black for $13.99. Coupon code "MSSOSUWJ" cuts it to $10.49. Plus, Prime members receive free shipping. (Non-members can spend $49 or more to qualify for free shipping; otherwise, shipping costs $6.14.) That's $10 off and the lowest total price we could find. It accommodates phones up to 5.5" and features water-resistant lycra and neoprene construction, a key and card pocket, earbuds slots, and 8.5" to 15" adjustable strap.