Wow! when I think one can get a mint 2007 M with less than 5,000 miles for under 35,000USD ! 
http://www.cars.com/go/search/detail.jsp;jsessionid=diBYvuxNbxC924ksmOGLUrZ?tab=summary&paId=316649908&recnum=&actLog=&listingId=27580463&paId=316649908&listingRecNum=5&criteria=sf1Dir%3dASC%26alMdId%3d22334%26mkId%3d20005%26stkTyp%3dU%26mdId%3d22334%26rd%3d100000%26crSrtFlds%3dstkTypId-feedSegId-mkId-mdId%26zc%3d05403%26rn%3d0%26PMmt%3d1-1-0%26stkTypId%3d28881%26sf2Dir%3dASC%26sf1Nm%3dmiles%26sf2Nm%3dprice%26alMkId%3d20005%26rpp%3d50%26feedSegId%3d28705&tracktype=usedcc&pageNumber=&numResultsPerPage=50&largeNumResultsPerPage=0&sortorder=descending&sortfield=PRICE&certifiedOnly=false&aff=national
http://www.cars.com/go/search/detail.jsp;jsessionid=diBYvuxNbxC924ksmOGLUrZ?tab=summary&paId=316649908&recnum=&actLog=&listingId=27580463&paId=316649908&listingRecNum=5&criteria=sf1Dir%3dASC%26alMdId%3d22334%26mkId%3d20005%26stkTyp%3dU%26mdId%3d22334%26rd%3d100000%26crSrtFlds%3dstkTypId-feedSegId-mkId-mdId%26zc%3d05403%26rn%3d0%26PMmt%3d1-1-0%26stkTypId%3d28881%26sf2Dir%3dASC%26sf1Nm%3dmiles%26sf2Nm%3dprice%26alMkId%3d20005%26rpp%3d50%26feedSegId%3d28705&tracktype=usedcc&pageNumber=&numResultsPerPage=50&largeNumResultsPerPage=0&sortorder=descending&sortfield=PRICE&certifiedOnly=false&aff=national
About what I paid for my 2007 M with just 3989 miles and CPO warranty out to 100,000 miles. Mine does lack the nav package but did include alarm system.