Loads of free hair at this site. Some Star Trek ones too. Hair can be used across figures. Just use the XYZ Trans and Scale dials to fit the hair and then go to "Object" and "change parent' and pick the figure's head.

http://www.comm.unt.edu/~ktaylor/downloads.htm

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi