BuyDig offers the Able Planet NC600 Clear Harmony Active Noise-Canceling Headphones for $99. Coupon code "POWER50" cuts it to $49. With free shipping, it's the lowest total price we could find by $21. They feature LINX Audio, SRS WOW 3D surround sound, on-ear volume control, 20Hz to 20kHz frequency response, and more.