Groupon offers the Able Planet True Fidelity Active Noise Cancelling Over-Ear Headphones in Silver Chrome, model no. NC300B, for $29.99. Apply coupon code "SALE" to cut it to $26.99. (BuyDig charges a buck more for a similar set.) With free shipping, that's $2 under our September mention and the lowest total price we've seen. (It's also a current low by $9.) These headphones feature active noise cancellation, adjustable headband, in-line volume control, LINX audio technology, and 20Hz to 20kHz frequency response. The noise cancellation function requires one AAA battery (included). Deal ends November 13.