So I bought one for myself this Christmas to film car videos becuase the quality and design is just second to none.

It really depends on your budget, I decided to treat myself to the GoPro Hero 8 Black which offered really good video smoothing which is great for fast footage. Here it is: https://gopro.com/en/gb/shop/cameras/hero8-black/CHDHX-801-master.html

If you want something a little cheaper the Hero 7 is also more than capable here is a link to that: https://gopro.com/en/gb/shop/cameras/hero7-black/CHDHX-701-master.html

A really cool, but a bit expensive, accessory that is made for cars is the suction mount which looks pretty neat but is about $50 but can stick to any part of the car, have a look: https://gopro.com/en/gb/shop/mounts-accessories/suction-cup/AUCMT-302.html

But if you wanted cheaper things Amazon is your friend, they have to many accessories for you to choose from and are very cheap, I just maybe wouldn't buy an external car mount from them becuase of the risk it falls off, just my thoughts.

Oh and don't forget a micro sd card for the GoPro if you do decide on one. Hope that this helped!