I have tried finding where to go to purchase the extended warranty here on the Prius Chat site. However after 45 min of looking and trying I'm still in the dark! I'm either really stupid or it's not as easy to find as I thought it should be!
I myself do not think it's worth the extra money because I have an '07 Prius and have not had ANY trouble with it, however my doubting husband sleeps a lot better knowing that IF something does go wrong, it's there