Newegg offers the Sennheiser HD 518 Over-The-Ear Audiophile Headphones for $99.95. Coupon code "EMCATNS56" cuts them to $54.95. With $1.99 for shipping, that's tied with our mention from three weeks ago for the lowest total price we've seen. (It's a current price low by $16.) These open-back headphones feature a frequency response of 14Hz to 26KHz, Duofol diaphragms, and 10-foot cord. Deal ends today.