Amazon offers the Alaska Bear Pro Running Armband for Smartphones for $9.99. Coupon code "ARMBANDD" cuts it to $4.99. Plus, Prime members bag free shipping. (Non-members can spend $35 to qualify for free shipping; otherwise, it adds $6.03.) That's $11 off list and the lowest total price we could find. It features an adjustable strap and key holder and is compatible with Apple iPhone 6 and Samsung Galaxy smartphones.

Note that this item is backordered until September 13, but can still be ordered at this price for delivery when available.