internet sales dept is probably your best bet. They were willing to say "I can do just $1500 above invoice" without sugarcoating or selling anything. This was before the economic downturn... so now you will probably have even better luck with them. I went to cars.com or something like that to start the mass-email process.

If they still can't give you an invoice price, you can at least use that price to compete with other dealers - they will fight over you.

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'08 X5 3.0si - Alpine White / Saddle Brown interior
Specs: Sport Pkg, Premium Pkg, Tech Pkg, Comfort Access, Aero Kit, Style 433 staggered 20s on Conti DWS
Mods: Carbon 35 tint, LED angel eyes, GP Thunder 7500k fogs, H&R 20mm/25mm spacers, clear reflectors, gunsmoke-tinted taillights
Coded: Digital speedo, windows/sunroof/tailgate close via keyfob

X5 pics at Flickr