If you wait until the last day of the month, you can get a better deal. Dealership car sales have been crappy all year. They are now getting more from the manufacturers in unit sale bonuses, than in grossing each vehicle sale amount.
If you stroll in, show interest, then tell the sales-weasle "I already have a car, so I don't really need to make the move now. I'll think about it". Make sure they have your name and number.
I guarantee he/she will call you the next day with a lower price. Once again, "I really don't need a new car right now, I'll call you back in a few days."
Then, on the last day of the month/year, stroll in and play hardball. Make them lower the price at least twice while hedging. Then when you see the sales weasle get completely demoralized, offer them $200-$500 under their last offer stating that you'll take it.