I have made a great inside or outside of the car camera mount. I use the smaller suction head for a driver cam and the larger for a outside winshield/high speed shot.

Here is a link to a photo just like my mount: Wood's Powr-Grip Co., Inc. | Vacuum Cups | Mounting Cups | 6" Concave Vacuum Cup with Gripper Head (http://www.powrgrip.com/cgi-bin/powrgrip/TL6PH3025.html?page_class=sporting)

I purchased my suction base here: Wood's Powr-Grip: Camera, Scope and Accessory Mounting Cups (http://www.mytoolstore.com/woods/mounts.html)

Mounting a standard spare Bogen tripod head and using a threaded bolt, I cut the head off then threaded the bogen head to it (the mount and the head both use the same size of threads).

I have seen the very same mounts going for $150 and up.