exogear

Great iPhone Mount For Less Than $20

Exomount’s patented suction technology enables you to mount on almost any flat surface such as car dashes, glass, wood, metal, plastics and even drywall! Polyurethane lined grip keeps your phone or GPS safe and secure. Quickly and easily mount and unmount your phone or GPS with our stylish clip grip holder. Mounts all smart phones and GPS devices up to 5-inch screens. Multi-angle rotation for your preferred viewing angle.

I just picked up this mount from Amazon for $18.99 to use with my iPhone and TomTom GPS app and it works great! It really sticks to the glass and keeps a tight grip on the phone with little shaking while driving.