http://www.realoem.com/bmw/showparts...08&hg=31&fg=95
That one? It's $416 here: http://www.realbmwparts.com/partloca...&siteid=215477
Husker BMW (http://www.bmwmercedesparts.com/part...&siteid=215771) is usually the cheapest but in this case at $460, they're not. It's $515 at Tischer. It pays to shop around sometimes.