I've been using one of these for the past few months...
http://www.amazon.co.uk/In-car-Digital-Camera-Recorder-RECORDER/dp/B009S3JN1W/ref=sr_1_1?s=electronics&ie=UTF8&qid=1369331518&sr=1-1&keywords=road+eye+in+car
They aren't amazing, but are 'good enough' for a basic camera, once you decipher the instructions. Come with charger / cig lighter lead, Software (not needed) and a 3 way swivel suction mount for the windscreen.
Wattsie