I did the same thing as I've had numerous encounters with texters and general idiocy. Amazon is where I got mine. The suction cups are horrible. I bought a mount that clamps it to the review mirror. great resolution and you need the micro sd card also.
If you plug in Black Box G1W into youtube, there's all kinds of video people have posted using it.
Black Box G1W Original Dashboard Dash Cam - Full HD 1080P H.264 2.7" LCD Car DVR Camera Video Recorder with G-Sensor Night Vision Motion Detection WDR 140° Wide Angle 4X Zoom - NT96650 + AR0330