Amazon offers the Sennheiser HD 600 Over-Ear Headphones, bundled with a $150 Amazon Gift Card, for $399.95 with free shipping. Assuming you'll use the gift card, that's tied with our mention from Black Friday week (although we also saw them for $11 less earlier that week) and the lowest total price we could find now by $150. These open-back circumaural headphones feature a 12Hz to 39kHz frequency response, 300-ohm impedance, Kevlar reinforced detachable 10-foot cable, and aluminum voice coils.