I assume you want used? Might want to try the slowtwitch forum classifieds and the serotta forum classifieds. Lots more stuff goes through those (including a reasonable number of Zipps)

http://www.serotta.com/forum/

http://forum.slowtwitch.com/

And then there is this set on RBR: http://classifieds.roadbikereview.co...ct=19479&cat=7

Good luck!