Monoprice offers its Monoprice Premium Hi-Fi DJ-Style Over-the-Ear Pro Headphones in Black, model no. 8323, for $15.99. Coupon code "31ST" drops the price to $13.59. With free shipping, that's tied with our mention from three days ago, since expired, as the lowest total price we've seen. (It's the best deal today by $6.) They feature a 20Hz to 20kHz frequency response, 50mm drivers, 90-degree swiveling ear cups, 3.5mm jack, 11.5-foot and 50" 3.5mm audio cables, and 3.5mm to 1/4" gold-plated adapter plug.