World Wide Stereo offers Able Planet Extreme Noise-Canceling Stereo Headphones in Green, model no. XNC230G, for $59. Coupon code "BRADSXNC" cuts that to $49. With free shipping, that's the lowest total price we could find by a buck. These headphones feature active noise cancellation and 20Hz to 20kHz frequency response and require one AAA battery (included).