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 "TRIPLE" to cut it to $26.99. With free shipping, that's tied with our mention from last fall as the lowest total price we've seen. (It's a current price low by $13.) 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 March 5.