You should never buy a car from the first showroom you visit because you’ll save money if you visit more than one dealer. For example, one dealer might offer to sweeten the deal by throwing in free oil changes for life, while another one might give a higher percentage off the MSRP. Once you’ve visited a few dealers, go back to the dealership with your research about the vehicle you want.
For instance, when negotiating the final price, you could say, “Dealership X said they could give me this vehicle for $X. Can you meet that number?” or, “Dealership Y is willing to give me free oil changes for life — could you make the same deal?”
In another example, the salesperson might say the vehicle you want is the last one on the lot in order to create a sense of urgency. You could counter by saying you could get a similar vehicle from another dealer instead of rushing to snap up that particular car.