I have bought numerous items from this outfit in Vacaville, CA.

Front DM Brake $50

Rear DM Brake $50.

My SLR has the Bontrager DM brakes and I am riding Schwalbe Pro One TLE 28mm on Bontrager XXX2 carbon rims (probably the widest rims that can fit). I did get some fresh chip seal fragments scraping the brakes the other day.