This has worked twice for me in the last 5 years.
SHOP the dealer lots and the Internet to find out what is in the market versus what you want. Use Edmonds or whoever to get cost figures on the vehicle you want.
Be ready to buy the
LAST BUSINESS DAY OF THE MONTH and have a finance plan in your back pocket from your bank or credit union. You will pay Dealer Invoice price + title fee + sales tax - current rebates
PERIOD. There is no added Prep Fee or Document Fee or Paint Protector. You want a wheel alignment included because that is part of the Prep Fee the dealer receives from the factory. The wheel alignment is close but not correct. You don't want to buy new tires in 6,000 miles because steel belts are showing on 2 tire shoulders and the other 2 are badly worn. Accept their financing if it is competitive to what you have from your bank.
If the dealer won't sell at this price, thank the saleman, express appreciation for the sales manager's time, and walk out the door politely. You will probably not get back to your car, before somebody says yes.
I did this on a used car. Price went from $13 K + tax down to $10,700 including tax and a wheel alignment with a copy of the computer printout for me. I had my own financing. I started talking before Thanksgiving and bought the car Valentine's Day
at my original price. Patience, cars are wants not needs.