Try http://www.edmunds.com . The site has plenty of information & a way to get quotes form local dealers. I have purchased 5 cars in the last 3 years from them (for family members & friends). Remember, negotiation is still a factor regardless of the negotiation medium – in person/email. I would NOT pay anything over what Edmunds shows as invoice. Keep in mind the options, TTL, and some possible rebates.
