I picked up a barely used Zipp 808 Zedtech front on ebay for a REALLY good price, it goes nicely with my Zipp 900 Disc.
Keep an eye out at the end of triathlon season and you can usually pick up something for a good price... they have usually been used for one race before the owner realizes that regardless of how much money you spend on gear, you still need the legs to push it.
JMR
When's the end of tri season?