VM Innovations offers the Sennheiser HD 558 Headphones for $113.99. Coupon code "EC36YGKJ" cuts it to $89.99. With free shipping, that's tied with our February mention as the lowest total price we've seen. (It's a current best by $25). These stereo headphones feature high-end open circumaural headphones, E.A.R. technology, and 15 to 28kHz frequency response.