They are by a nuclear bloke from Texas called Jim Aud apparently, who also does a $900 USB cable. http://www.thecableco.com/Product/Ultimate-USB

edit - I'm going to stop looking through that website, it is making me upset. They have a 1m power cable called avatarII for $16,950 from some criminally deranged outfit called pranawire - http://www.thecableco.com/Product/Avatar-II