I have this one, work fine.
Overview: The AIMS Power can-size 150 watt power inverter is designed to fit into any cup holder that will hold a standard size soda can. This inverter is designed so it doesn't roll around in your car and fits perfectly in your cup holder so you can charge equipment such as laptops, MP3 players, games, cellular phones, cameras or any electronics that require 120 watts or less
http://www.theinverterstore.com/the-...odel=pwrcup120