Play his game and offer him INVOICE ONLY then...
I showed mine a copy of BMWconfig and stated that I had other dealers willing to do it for $200 over cost if I wanted to travel. He finally conceded.
The other thing missing from the BMWconfig "invoice" is the MACO cost which are $400 so if his Invoice is $400 higher than yours, that is the difference and yes, they can both be INVOICE (just with differing components). Some have gotten MACO waived, others have not been able to.
'12 X5d Sapphire/Black/Bamboo, Sport (ZAP), Premium (ZPP) & Premium Sound(ZPS) packages: 20" 214's, OEM Hitch
'11 Victory Ness Cross Country!!!
GONE - '06 750Li Sapphire Black/Creme&Black (Loadeddddd)