Koss ESP-950 Electrostatic Headphone Bundle.
Includes a Koss 5-pin to Stax 5-pin adapter cable for free. (Normally $149)
Also includes an Out Of Your Head software license for free.(Normally $149)
Koss ESP-950's come complete with carrying case, amplifier, battery pack, and extension cable.
Currently out of stock. If you place a backorder now, item will ship in about 2 weeks.