Today only, Sennheiser offers its Sennheiser HD700 Headphones bundled with a HDTRACKS $25 Gift Voucher for $749.95. Apply coupon codes "198762" and "HDRADIO" to drop the price to $423.96. With free shipping, that's the lowest total price we could find by $326. They feature open-back ear cups, detachable silver-plated oxygen-free copper cable, and balanced audio reproduction.