I love to negotiate with car dealers and occasionally help friends with purchases, which grates on the salesperson. I always ask about financing or leasing, since the dealer makes more that way. When I get the price I want, I then pay cash, unless they offer 0% financing, which I got for my Subaru Outback Limited XT in 2021. I also make it clear that if they attempt to waste my time with GAP or extended warranties that I will walk out. The salesperson isn’t my friend; he’s my sparring partner. As others have said, they won’t sell the car at a loss, so the back and forth is simply kabuki theater.
I also make them remove any dealer decal or license plate frame, unless they want to pay me a monthly advertising fee.