email all the dealers you're willing to buy from. look at their inventory online and get a price on a specific vehicle. the dealers who will actually be willing to sell at the best price are the ones who will give it to you in an email. all the best!
The only sorta kinda Prius-specific advice that comes to mind is to test drive one. A few people can't stand the layout, visibility, or seat positioning. Otherwise the Consumer Reports car buying advice applies.
Call and ask for the "internet sales department" dont talk to a regular salesman. The internet department will have better prices.
