In reply to fast eddie: Got myself 13+% off a new car, was looking for new or up to 2 yr old at the time. Had to take the finance out from them as well but at a reasonable rate on that as well 6-7%.
All depends on what you are looking at. The car I was bought was pre registered and already with the dealer, some of the Car Supermarkets I went to had very competative pricing to start with but absolutly no discounts or negotiation.
It's counter intuative, we all want to get a discount, but is what you are paying for what you are getting a good deal. try to think are you getting a good deal, rather than is it a good discount.