I think there is one located right next to the restaurant at the end of the universe. Sorry, couldn't resist. Welcome to X5 World.

www.usedpartslive.com - have never used them myself.

www.unitedautorecyclers.com - have used them, but not via the web search (have called and had them search)

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2007 X3 3.0si, 6 MT, Premium, White

Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue