Your best bet is to locate the part number on realoem.com and then compare prices at pelicanparts.com or getbmwparts.com. Both of those sites sell genuine BMW parts for much less than the dealership. Otherwise, perhaps you can locate an e36 at the junkyard and get the parts you need for even cheaper. Anyway, here's a link to the realoem diagram and parts list for the door lock actuator:
http://www.realoem.com/bmw/showparts...62&hg=41&fg=40 I highly recommend going to the realoem homepage and entering your vehicles information. Once you have your vehicle plugged in, create a shortcut to your desktop for future referrence. It'll open the realoem.com search page with your vehicle's information already plugged in
BTW, it looks like the door latch pieces are sold individually.