Tripped across this link in a GameDev post, thought I'd share. I know little of it, so I'll steal the words from Orange Brat:
http://www.truebones.com/
If I need cheap mocap, I can get it at the address below. There are over 1000 motions available for under $100. All I need is a copy of fragMotion to rig and export to my format.
http://www.truebones.com/