They will give you less than $35k first to see if you bite. The vehicle I just purchased for under $40k is similar to yours, 42k miles, but add M-sport pack, third row seat, leather dash, vented seats... pretty much all options. Hope this helps.

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LEV
2011 X5 xDrive50 Black/black////M sport pack/all options
2006 ///M3 Cabrio Gone but not forgotten
2003.5 ///M3 Gone but not forgotten
2007 Aston Martin V8V Gone but not forgotten
2007 Porsche turbo Gone but not forgotten
1995 540i M-sport(1 of 70) Gone but not forgotten