There is a thread on renntech about how to upgrade to poly bushings on the cheap for swaybars:
http://www.renntech.org/forums/topic/21681-polyurethane-sway-bar-bushings-heres-how-and-cheap/
Oddly I can't get to renntech from work, I was able to get the link but I can't click it to see what it actually says though. I seem to remember reading it from home recently.