The ones that I have seen are not that discreet as they mount them using the fuel-cap bolts using stainless frames and they are complete video units. I would start looking at digital cameras on Trademe for idea's on whats available 
Edit - I have seen little "spy-cams" that you can plug-in, but again, they rely on full-on video cameras normally lying around your pack etc
It's been a rough day. I got up this morning, put on a shirt and a button fell off.
As I ran out the door, I picked up my briefcase, and the handle came off.
Now I'm afraid to go to the bathroom.
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