Rotiform built a set of wheels (currently they are 1 of 1) for my 2013 BMW M6. The wheels were used for the 2016 SEMA show while the m6 was laid out in the Accuair Royal Flush display. They are 21" wheels and built to spec for the m6.
These wheels retail for $7,500 - $8,000. This is the first wheel done in this new 3 piece design so they are technically 1 of 1 at this time (model: BUC). These wheels are brand new and have no blemishes. They do NOT come with tires.
Price: $4,200
You can see the wheels in the Accuair Video:
You can see pics of car and wheels on my IG:
http://instagram.com/biigbrian
Brian