$600 is way too high a price for the key, I believe. I got a spare key a couple of months ago and the price was around $130.00 for the normal key with integrated door / rear hatch lock/unlock functions. Also got the BMWCCA discount.

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2005 X5 4.8is/ Imola Red/ Cream
2002 ///M Roadster/ Alpine White/ Imola Red (SOLD!)
2008 ///M5 ordered and on it's way!!