My least favorite thing is to buy/sell a vehicle. I don't care it is 458 italia, McLaren, or even a SLS AMG.

Small dealership usually will have everything ready when you email/call them with VIN, Price, Stock#, and etc. However, big dealership are tend to be little unorganized due to high volume of traffic. I've usually dealt with smaller franchise dealership on weekdays. It went real smooth. I would try to avoid those late 70s or early 80s type of operation dealership (dealing doug, some domestic dealerships). They are huge mess.

IF you had a specific stock number at certain advertised price, but if they do not honor it, I would definitely call the management. IF that does not work, DORA and Lakewood is next step.
Luckily, ALL the dealership I've been to within 10 years always honor the price of ad and/or lower, but I guess there are still some shady 70s dealerships type of places out there.

Speaking of dentist and MD's office. I would rather buy 10 cars at a shady dealership than go to dentist or some shady hospital.
Hospitals are worse than shady attorneys or sales people. At least I know what I will be paying for upfront. Hospital thinks they are monopoly and knows they are selling service which are inelastic. They will do the service and ask 150 premium on some kind of testing which cost fraction in different places.
No wonder people are going out of country for "medical vacation package" at a discount price for far superior service (from experience).