Harman Audio offers the AKG by Harman K242 HD Semi-Open Headphones for $153.97. Coupon code "K242HDAKG89" knocks it to $88.97. With free shipping, that's the lowest total price we could find by $70. They feature a frequency response of 15Hz to 25kHz, 55 ohms impedance, and a 3.5mm gold-plated jack plug.