Just be patient and wait for them to get into wrecks and wind up at dismantle yards. Then you can pick them up for a few hundred vs a few thousand from the dealer.
http://www.ebay.co.uk/itm/BMW-F30-20...item3a7bbca399
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'98 Dinan/RMS stage 2+(VAC cams, CES Cutring etc)
'15 Buick Regal "T"(wife)
'06 Saab 9-5 Combi 5mt (full suspension, LSD, clipped turbo etc)