For pre-lci e90:
Angel eyes bulb. Can be bought as an assembly light bulb+reflector from a dealer for $82+tax in Canada. But it is quite easy to take the existing one apart and just replace the burnt bulb. The bulb is:
Philips 12082 12V 10W (impossible to find, at least in Toronto)
can be replaced with Osram 64113 - only found it at NAPA @ Dundas&427 (Toronto).
Picture:
http://www.donsbulbs.com/bulbs/g632/...40h%7chmb5.jpg