The price advertised is substantially lower than w...

The price advertised is substantially lower than what they will accept. Prepare for an additional $3500 at least! And the Full Featured Car Salesman Mind F-ing.

Stick to the advertised price and they will act like they will meet it.

You will end up walking out or you will feel screwed.

They are nice about it:

-"Would you like a water?"
-"We don't give cars away!"
-"The advertised price doesn't include all of the extras!"

ALL CAR DEALERS ARE TRYING TO MAKE YOU PAY MORE THAN YOU SHOULD

Solution: Pick a car. Decide on what you want to pay. Tell them you WILL NOT deviate. If they can do it: great! If they can't do it: walk away.

Simple? Yes!
Irritating? Yes!
Unnecessary? Yes!

Good luck!
Be firm!