When I was looking a few years ago, the only ones I could find were made by Audioquest as part of their G-Snake line. A very good cable, but if I was buying today, I would probably look at the Cardas:
http://www.cardas.com/content.php?area=products&content_id=1&pagestring=Interconnect&product_id=73
http://www.cardas.com/content.php?area=products&content_id=1&pagestring=Interconnect&product_id=73