Cast a wide net in the NY/NJ area and email all dealers with in-stock units that match what you’re looking for. Your locations gives you access to getting the best deals on your own without shipping.
The brokers in the marketplace forum are offering 3 series demos around 16% off and new 3 series around 12% off. So those are very attainable numbers. There are also a couple east coast BMW dealers on here that you can give a quick shout to see if they need to move a 3 series by the end of the month, like @BMWPros and @bretbmw
Please search regarding MSD.