Or you might want to search for Windshield suction mounts, as they are the easiest to move in a different car, something along the lines of this one:
[ame]http://www.amazon.com/RAM-Mounting-Systems-RAM-B-166-AP8U-Windshield/dp/B0042HJOOA/ref=pd_sim_sbs_e_3[/ame]