Find out exactly what you want, then call all the dealers within a couple hour drive of you, tell them exactly what you want and let them know you are talking to all the others. ASk them what their lowest price is, then lie like [redacted] about the last guy you just talked to and what what he offered.
Works like a charm on new cars. Does not work at all on used.
Works especially well with cars that have a lot of local dealerships, like chevy, ford, nissan, etc.
Had a guy at work do this with a mass fax. Never even spoke to a guy until he saw the offer he wanted then just went and signed the papers and picked the crap up.
Some of them get pretty pissed, but most of them squirm pretty bad. It's entertaining(no offense to pete).