Not sure if copying a link from ebay will work (and only includes the upper and lower bounds of your selections):

http://www.ebay.com/sch/i.html?LH_PrefLo...86.c0.m14.l1514

Search term: (E2140,E4400,E6550,Q6600) cpu
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Christian
#40104192 120Gb (no longer in my E36 M3, won't fit the E46 M3)