I purchased my first Prius in Fayetteville NC and after reading about Prius II decided to request the newer technologies that it offered. Started in Aug 2004 with my request and in early Jan 2005 was called with one that was in my ball park of options that I wanted. Traded the 2002 with I think around 45,000 miles. In August 2005, my wife and I had talked about trading our 2000 Ford Windstar in on another Prius. Made the required inquiries of dealers and then on a whim stopped by the dealer in New Bern NC where we live. Low and behold they had three on the lot and so we haggled a bit and the deal was done on my wife's Prius.
We had done some homework on the 2002 and the range throughout the US was from 15,000 to 23,000. We had set a figure of the tradein we would accept, which we got. It was not the top figure of 23,000 for one in CA, but was what we thought was agreeable to us. On the new one the tradein of the Windstar was ugly in our extimation, but the van was 5+ years old and we did not want to miss the chance. The tradein was 5,000 and someone got a good vehicle with 40,000 miles on it. You do not have much wiggle with a older non Toyota vehicle and we didn't want to try and sell it ourselves, we are not sales folk. Hope this gives you some insight on how we did.
Joe