Help with FY'16 Invoice Price and deal?

What/where can I find invoice pricing FY'16 on the 235? And does a proper deal look like?:confused2

My build is a M235:
Tech;
Drivers Assist Plus;
Heated Front Seats;
HK;
Destination.

MSRP: $49,720
Invoice: $_______?
Offer: $_______?

I appreciate any input and advice; its been a few years since I have been into a dealership.

Help with FY'16 Invoice Price and deal?