Harman Audio offers its factory-refurbished Harman Kardon NC Noise-Cancelling Over-Ear Headphones, model no. HARKAR-NC-Z, for $209.99. Coupon code "99HKNC" cuts it to $99. With free shipping, that's $20 below our February mention of a refurb and the lowest total price we've seen for these headphones. (It's also $81 under the best price we could find for a new pair.) These wired headphones feature 40 hours of active noise cancellation per charge and a frequency response of 16Hz to 20kHz. A 1-year Harman Kardon warranty applies. Deal ends May 31.