Since I paid cash, I didn't get this. I had to haggle for a cash discount.
However, back in the dark ages I ordered a Ford Ranger Supercab from the factory in Minniapolous, MN through the local Ford dealer hear in the SF Bay Area. It took a couple of months to arrive. When it did there was a check for $500 from the factory because they had an incentive start in between the time I ordered it & picked it up. The deal was letting people buying new cars by that time use the incentive from the factory as the down payment. YMMV.
I got the $500 back. By financing only $8000 and dragging it out 3 years, I pay only $400 in interest. I'm going to accelerate and make payments toward principal, so the sooner it gets paid, the less interest I pay. The approximate payoff is shown on the statement.