F-Color via Amazon offers the F-Color Universal Bike Smartphone Mount for $15.99. Coupon code "P7MRP5FB" cuts it to $9.99. Plus, Prime members bag free shipping. (Non-members can spend $49 or more to qualify for free shipping; otherwise, shipping costs $6.25.) That's $6 off list and the lowest total price we could find. It features 360 degree swivel and is compatible with most smartphones.