The lightweight GoPro video camera can be mounted to your car or anywhere else to capture action shots. If what you need is a magnetic mount that you can attach to any metallic surface, Instructables user nlinventor has a cheap DIY guide.
You will need the square plastic base with GoPro mount that comes packaged with your device, along with two neodymium magnets, magnet cups and the screws and drills to attach them. It's a fairly low-key project and shouldn't cost you too much.
You can get the step-by-step instructions with photos at the link below, along with a cool snow-blowing video from the Kubota tractor that the GroPro mount was attached to.
(Almost) Free Magnetic Mount for GoPro camera [Instructables]