This is not quite in the same league but a lot cheaper. No good for anything deeper then 30m and longer then 54mins but memory is cheap these days. I am sure I have seen a headband mount for it somewhere on the net too. If a get a spare £100 I might try one out.
GoPro Digital Hero 3 Waterproof Camera - £84.15 : The Adventure Store, Surf, Skate & Board, Clothing & Accessories