I've got a shitty K6000 knockoff you can have. resolution is pretty horrid but it gets the job done. You can have it for free.

I ended up getting a refund from the seller (due to it being fake) and got to keep the camera as well. has all the bits, with suction mount and cigarette power supply.

My plan was to use it as a rear facing camera but trying to get power to it at the back of the car was a pain so I didn't end up installing it.