I have a helmet/action cam for sale as per lonk hardly used as new codition will require sd card and batteries.
30FPS Compact Action Sports Helmet Cam Camera Camcorder on eBay (end time 16-Jan-11 21:16:30 GMT)

Looking for £25 to your door.
Matty

To be fair your link is quite a dear place to buy them.

Mini DVR Helmet Video Camera Action Sport Cam Camcorder on eBay (end time 13-Jan-11 09:04:59 GMT)

Open to offers just searched for them and that was first link I found.