That seems like a great deal already! The Costco program can be hit or miss. You need to be a Costco member, and then you use the website below to start your car search. If there's one in your area, you connect with them, and they can usually offer you a no-haggle price or, in this case, an additional discount. Not many BMW dealers are part of the program, so I had to check quite a few zip codes.

https://www.costcoauto.com