Groupon offers the Audio-Technica QuietPoint Active Noise-Canceling Over-the-head Headphones, model no. ATH-ANC25, for $49 with free shipping. That's the lowest total price we could find by $20, although they were $14 less over a year ago. Features include a frequency response of 20Hz to 20kHz, noise reduction of up to 15dB, 40mm drivers, gold-plated 3.5mm detachable plug, and more. It ships with a carrying pouch, 2-prong airline audio adapter, and AA battery. Deal ends October 23.