Two suggestions: 1) Google "Mobius camera." It's a small video camera (about $80) that many people use as a dash cam, mounted on a suction cup windshield mount. It has very good low-light performance.
If you intend to keep it in the car, you'll have to plug it into your vehicle's power. 2) Google "SJCAM SJ4000." It's a bit larger camera but is frequently used as a dash cam.
It also has good low-light performance. It's about $80 (without WiFi). Make sure you buy one from a reputable source and that it has the SJCAM logo on the front.
Both cameras record video in high quality HD 1920x1080p 30fps, or less if you prefer. Both use a micro-SD card, which does not come with either camera.
This sight might help: http://dashboardcamerareviews.com/ It includes some example videos as well.
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