I am actually surprised though, that the car sales man didn't ask how much he could pay. If the FBI negotiator still stuck with his initial offer, I guess he would have suggested some kind of monthly rate or a similar kind of loan that would "fit his lifestyle better".
Funniest thing was we had gone to a local dealership to attempt a test drive and they wouldn't even talk to us. The guys who won our business then sourced the vehicle from that same dealership -- they drove it up to our house with the local dealer's plates on it, for something like $6k less than the dealer's sticker price.
I left out one detail -- we ran our offer past the other dealers who had responded and none would match it.