I'm moving to a place without snow and need to sell my M3 winter wheels/tires before mid next week:
They are 235/40/18 all around with Blizzak WS 60s. These provide EXCELLENT traction on snow and ice. There are tires that are sportier to drive, but for snow/ice traction, I think these are outstanding. If the M3 is your only winter ride, these are what you'd probably want. They are on A7 Sport Edition wheels with BMW center caps. I've driven on them for 1 and a half winters but I only drive 1-2 days a week and not very far. They are still in excellent condition. I think they were around ~$1,500 from Tire Rack but I can't remember the exact price (I bought them off someone else who only had them a couple weeks).
Price is $650 for the set.
PM me an offer if you are interested.