Most upvoted comment
Idiot stay in your own lane!(r/WTF)
Got mine on Amazon for $35. Ridiculously cheap when you consider the alternative. Thing does 1080P and uses a MicroSD card for many hours of looped recording.
I figure eventually cars will come with these built in. Until then….
Edit: Link thanks to Redditor psychoacer below. He knows me well. Dashcam via Amazon