Car purchase below invoice price

Hi blind, I went to a dealership to inquire for a car. Mentioned my employer and they said I can get the car at invoice price because Microsoft is a supplier of this manufacturer. I also verified this afterword on the passport app. Q: can I go any lower in price, can I ask for more add on, $300 gift card, oil change etc? Passport listed a different dealer with the $300 gift card, but only this dealer with the supplier discount. Best of both worlds would be awesome The sales rep said this is the lowest price they can go without me really engaging in any negotiation so it seemed clear to not try. Before I purchase I just wanted to ensure that I’m not leaving anything on the table. TC:230k YOE:6 #car #auto