Onboard CAM

hey guys, i know there is the traxxas gopro, but i'm just curious what you guys are using for onboard camera

I plan to use it in my maxx, and some robotics applications. I dont need it to transmit any data, just good quality video i can pull off later.

Here are my requirements
-small
-lightweight
-good quality video
-uses memory cards for fast switch out.
-fairly cheap (i plan to put 3-4 on each robot and i have 7.....)

THANKS A BUNCH!