Budfromballground is right. I did more research and it appears I was wrong. I was under the impression that the 3 day "buyer remorse", also called "cooling off" period applied to new cars in many states, but actually it seems NOT to apply to new cars in any state (unless of course, the dealer puts in such a special clause in a contract, which I haven't seen such).
However, many dealers do inact a 3 day cooling of period of sorts. Most I have dealt with, in a couple of states now, take a deposit with a signature of deposit on the vehicle. Sometimes the deposit is as small as $100. This just gets the ball rolling. Then, delivery of the vehicle is set for 3 days (or more) later. All final paperwork is done the day of delivery, and that's when the title/transfer is complete, etc.
Also, this is an excellent point for all...do NOT sign any contracts of sale, or contracts related to accepting delivery until you are ready to drive the vehicle off the lot.
Oh, and one last thing, have the vehicle pointed towards the dealer lot exit before signing any of the final paperwork. One of the saddest things I ever saw was a young women in tears because she and her husband just signed the final paperwork for her brand new white Mitsu Eclipse, and then the sales guy backed it into a pole as he was moving it over to them...nice basketball sized dent on the rear corner, and a busted taillight, etc.
TJR