Remember that new 2008 are 25% in stores now. Also, in early 2008, all 2007 Waroos were buy 2 get one free.
Lastly, people buying used kites want deals, they dont want to spend a premium on a really good condition used kite. They would just opt to spend a few bucks more for a new one. Take this advice:
Use the advance search button on ikitesurf for used kite gear. Specifiy 2007 Waroo for the last 4 months. That will give u an idea of what the asking prices have been. Look at who has replies and who does not. Those with no replies are usually priced above the market value. Those with replies have most likely sold but for about 15-20% less then asking price.
Good luck. And remember, with the number of Waroos that have been sold, if you cant get the deal you want on one another one just like it will pop up the very next day.
"Kites rise highest against the wind - not with it"