I've added some helmet camcorders to the shop. These are 50 FPS and water proof. They take SD cards and normal batteries.
Features:
* Waterproof
* Built-in microphone
* Uses AA batteries
* Reinforced rubber casing
* Can mount almost anywhere
* Supports SD card up to 8 GB
* Timestamp ON/OFF function
* Records at 640 x 480 resolution
* Records AVI video at 50 frames per second
* Great for all types of action sports such as two or four wheel vehicle racing, skiing, biking, rock climbing, paintballing and skydiving.
http://www.offroadexpress.co.nz/marketplace/waterproof-action-camera

Cheaper than on trademe!