How about just an old iPhone or Android device? Most of us will have a few lying around in your household. Just repurpose, now what's a good dash cam app to use is the question I want to know.
I used Nexar a couple of times, but want some set it and forget it option. Maybe setup my iPhone in kiosk mode, a GoPro mount on the windshield. last few generations of phones can probably do a few hours without the need to recharge. This is what I'm planning to use on my CT when it arrives.