rear seats?

[why?]

one thing you need to check out is the differences of the car in your region. Different toyota regions get different packages.

for instance, in new england and the northeast the all weather package was standard, as as well as (i think anyways) some sort of different suspension.

each region will also have different packages that they have more of, and some combinations that they will not carry at all.

as for negotiating, you can never have enough info. use all the websites, edmunds, kbb, nada, etc. the more info you have, the better you can do.

also don't be afraid to negotiate every single little thing. the salesperson might get annoyed, but you are trying to get the best deal you can, and these things aren't cheap.