Yup my thoughts as well. Once the deposit has been paid even if there are no legal ties, you have stated your interest firmly at the asking price. I doubt any salesman worth his salt would cave. But always worth a try.If you've paid a deposit (or holding)
Surely the deal has been agreed?
Surely the time to haggle is before?
On big ticket items like vehicles I always haggle. But always be prepared to walk away. A good salesman will know if you are only bluffing.