Get A Better Deal

Go at the right time. At the end of the month, dealers are trying to meet quotas and may give you a better deal just to get their sales numbers up.
Do lots of research first. On kbb.com you’ll find the average price a new car is being bought for (the New Car Blue Book), and what the dealer actually oad for the car (the Invoice). Start bidding at the incoive value—anything higher is money in the dealer’s pocket. Used cars are given a Blue Book price—that’s the most you should pay for your car. Remember to print out your research so that if the seller balks, you can support your offer.
Try for more stuff. If the price is still to high, ask the free extras (like a sunroof). Say "It’s over my budget, but if you’d upgrade it, I’d reconsider."