LKQ has been selling a bunch of these lately on eBay... I missed the ones from a couple weeks ago, removed from several '08 650i cars. They all went for $99/pair, and this week, it appears the donor car is a E60 M5. I believe these are still the same L7 driver, just in a different enclosure.
http://cgi.ebay.com/ebaymotors/ws/eB...m=200538324051
http://cgi.ebay.com/ebaymotors/ws/eB...m=190463288049
http://cgi.ebay.com/ebaymotors/ws/eB...m=200538336625
http://cgi.ebay.com/ebaymotors/ws/eB...m=190463283447
http://cgi.ebay.com/ebaymotors/ws/eB...m=200538330208