There was an M3 sitting on the lot at Long Beach BMW a few weeks ago that didn't have a price above MSRP written on it, but I didn't ask anyone so I don't know what they were actually selling it for. There was no 'sold' sign on it, so it doesn't seem that it was spoken for.
As an aside, I saw two M5's sitting on the lot without buyers at Irvine BMW last week. One of them looked like it had been sitting on the showroom floor for quite a while - you could see scratches all around it, 'ring marks' from people gliding their hands across the car as they walked by. I *hate it* when people do that - that's either stupidity or total lack of respect.
The salesman that was helping me said the scratches could be rubbed out. Some of them were pretty deep, so that would require the removal of quite a bit of paint. I certainly wouldn't want that car (well okay if someone /gave/ it to me I might take it heh).