Most of the higher-end speaker companies don't allow their speakers to be sold on-line. I'm pretty sure B & W doesn't. They want you to converse with one of their trained, knowledgable dealers.
I own 5 B&W M-1's and Gene is right I have never seen them sold on-line. I think the B&W list price is $250 but If I remember the trained knowledgeable dealer in my area was selling them for $200, and that was a couple of years ago.