The G1W ($47.55) is a discreet camera with a 2.7 inch display that shoots 1080p (30FPS) and can store up to 32GB with an SD card. This device is powered via 12-volt cigarette lighter. The G1W is known as "The cheapest camera that works".
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Pro Includes motion sensor
the G1W can be configured to start recording when motion is detected.
Pro High definition camera with crisp picture
The G1W shoots 1080p at 30 frames per second.
Pro Fits behind the rear view mirror
The G1W isn't the smallest, but it is still very discreet and out of the way because it sits behind the rear view mirror.
Pro Easy to use, lean interface
G1W cuts out unnecessary features, so the interface is easily operable with minimum clutter.
Con Turns off as soon as the car turns off
If the car is off, there is no way that the camera can be recording.
Con Vibrations muddle the sound quality
Due to the G1W's cheap build, the parts rattle. This causes some interference with audio quality but shouldn't be a deal breaker.