I just watched a Steve Leto video about the shenanigans traditional car dealers pull on buyers. I'll never have to go through that again because all my future cars will be Tesla.
Negotiation: How much can you afford monthly? Getting a faux manager approval, psychological tricks ie: congratulations, you just bought a car.. ..
Up-sells after purchase:
Extended warranty / service contract, ceramic coating / paint protection, tire and wheel protection / wheel and tire insurance, GAP insurance, rustproofing / undercoating, paint-less dent repair protection, window tinting, security system / alarm upgrade / theft deterrent system, navigation /