I got a dashcam yesterday. It is the same camera that @autophile has. Cost 24 USD with 8GB card.
Anyone buying memory card for dash cam, don't buy anything less than 32 GB. I am going to upgrade to 64GB or 128GB.
4 mins of 1080p video takes up 1GB on this camera.
Video quality is *****, but then what else could you expect from a 20 dollar camera. 720p and 1080p video quality has no difference, it only takes more memory. You can't make out the number plate in front.
http://www.aliexpress.com/item/2015-Best-Selling-G30-2-7-170-Degree-Wide-Angle-Full-HD-1080P-Car-DVR-Camera/32281880884.html
I basically bought it to capture a oles that I come across on per minute basis on the road and post them on youtube.
One such piece of work coming right up.