Nothing to do with me, just stumbled on this:
http://www.benl.ebay.be/itm/BMW-Z4-E85-Bordmonitor-CID-6-5-Monitor-Display-Anzeige-/310554915215?pt=Technik_Auto_Hi_Fi_Navigation_Einbau_Navigationssysteme&hash=item484e83f18f
Price looks about right, I've seen them more expensive
EDIT: seems to be quite expensive and lots cheaper from BMW Munich...
http://www.benl.ebay.be/itm/BMW-Z4-E85-Bordmonitor-CID-6-5-Monitor-Display-Anzeige-/310554915215?pt=Technik_Auto_Hi_Fi_Navigation_Einbau_Navigationssysteme&hash=item484e83f18f
Price looks about right, I've seen them more expensive
EDIT: seems to be quite expensive and lots cheaper from BMW Munich...