One common misconception of haggling is that it must focus only on a single issue: price.
Although price might be the most important issue at stake, you could sweeten the deal for both sides by discussing other issues, such as delivery, financing, and the possibility of repeat business.

You can open up such opportunities through direct questioning or by making what Malhotra and Bazerman call contingent concessions—concessions that you link to specific actions by the other party.