Right now the Koss ESP-950 Electrostatic Stereophone is $699 at amazon, if you are interested.
http://www.amazon.com/Koss-160416-ESP-950-Electrostatic-Stereophone/dp/B000056ULH
http://www.amazon.com/Koss-160416-ESP-950-Electrostatic-Stereophone/dp/B000056ULH