I pulled this from my 2007 MT 335i when doing my Wavetrac install. It has about 55k miles on it and in great shape.
Note that this is the carrier only, no carrier gear, or carrier bearings. I suppose it can be used by someone who wants to make a welded diff or blew their stock one and needs a replacement. This was the bolted diff.
I'm really not sure on the price, but I think $350 shipped to the 48 contiguous states is fair. Make an offer if you disagree and I'll consider it.
I'll provide pictures of it when I get home this evening.