One of the dash cam names is sainspeed F198 HD portable DVR 2.5 TFT LCD screen, there are other names for the same camera, do a search on Amazon. The night vision sucks as does most of them unless you spend a few hundred dollars or more for one.
I bought a dash cam about 6 months ago for $20.00, bought a 16 gig card (good for 240 hours recording) for $10.00 both from amazon, I showed it to some of my friends and they each bought one. I have 2 motor homes & 2 cars with them in, they loop the video, they turn on and off with the switch,they have a great picture, I carry a extra card in my wallet so that if the police need to see the video for any reason, I can still use the camera with the spare card.I will post the name as soon as I get to my motor home to get one of the boxes.
The one dieharder recommended is as good as any. When you learn how to use the menu in it, it will do anything the more expensive ones will. I sell dash & spy cameras and this is the one that I use for myself. You can get one on ebay for 18.00 with shipping. Use a class 10 sd card in it. Any questions on how to do the menu pm me.