Try the Tony Hawkes Helmet-cam,cheaper but good results..Ebay,Amazon...
Uses cards as well,recording times depend on card size...http://www.amazon.co.uk/Digital-Blue-Tony-Hawk-HelmetCam/dp/B000AYAJ34/ref=sr_1_1?ie=UTF8&s=software&qid=1256907089&sr=8-1-spellany idear on recording time mate?