A "once only deal" off a salesman? Sounds like typical salesman tactics.
Get the info of the "deal" only if you genuinely could see yourself changing cars.
I just can't be bothered with their nonsense, "just need to speak to my manager", "I've already had loads of interest in the car", "someone wants to come in tomorrow to put a deposit down on it", "even I couldn't get this deal and I work here", etc etc.