Here is a tactic I like using. Write down a deal that YOU believe is fair.
ie.
-Selling Price
-Any Wants/Needs You have
-Etc etc.
On a sticky note (or better yet, maybe a business portfolio). Take it when you go, and be firm on it. Assuming your terms were fair, they will consider. Remember, a good businessman is ALWAYS prepared to walk.
I recently bought a used 2004 bmw and did this. My first note said
-$13,500
-No warranty (they were trying to sell one of those aftermarket ones that I told them I didn't want --- I am a do it yourself type of guy own garage etc.)
- See car on lift (to look underneath)
- Test drive again
I thought my terms were fair. They said no at first, so I walked. Simple as that. Sure enough, they called me back a few days later.
Also remember, that you are buying at the end of the year and dealers are looking for VOLUME over profit so you are at a MAJOR advantage right now. You can get stellar deals. When the calendar year rolls around, bam they lose value so the ball (and money) are in your court. Make sure they understand that you are in control and have the power, the money - and the options.