As one of its daily deals, Shnoop offers the M-Audio Studiophile Q40 Headphones for $79.99. Coupon code "Bc2RbNpE" drops it to $78.99. With free shipping, that's the lowest total price we could find by $21. They feature a frequency response of 10Hz–20kHz, detachable cord, noise isolation, and a collapsible design. Deal ends today at 9 pm ET.