Harman Audio offers the factory-refurbished AKG K 840 Headphones, model no K840KL, for $149.99 with free shipping. That's the lowest total price we could find by $10 for a new unit elsewhere. (Most merchants charge $200 or more.) They feature AKG's Kleer technology, allowing 16-bit playback over a 2.4Ghz radio link, a frequency response of 10.5Hz to 31kHz, and up to 28 hours of playtime on a full charge.
Note that the warranty information is unclear.