So you've signed everything except financing? Doubtful you can negotiate a lower price...
For my car, our finance guy snafu'd on the financing paperwork and we received a letter telling us to return the car ASAP since Nissan couldn't secure funding. So I'm sure there's a clause there that allows you to drive off the lot w/o financing set; if there's a problem, you need to return it and straighten it out.
Since it was the finance guy that screwed up twice, he paid for a tank of premium gas in the Murano the second time we drove up (45 min). If there's a third time, I'm gonna ask to test drive a GT-R.
