Sonic Electronix offers the Direct Sound Serenity II Over-Ear Headphones for $129.95. Coupon code "SerenityII99" drops the price to $99.99. With free shipping, that's tied with our August mention and the lowest total price we could find by $70. They feature a 20Hz to 20kHz frequency response, 40mm drivers, and provide up to 33.4 dB of passive noise isolation.