Harman Audio offers the Harman Kardon NC Noise-Cancelling Over-Ear Headphones, model no. HARKAR-NC-Z, for $165. Better yet, sign up for Harman Audio emails and receive a unique coupon code to knock the price further to $154.99. (The code will be emailed to you.) With free shipping, that's the lowest total price we could find by $45. These wired headphones feature 40 hours of battery life per charge and a frequency response of 16Hz to 20kHz.