As one of its daily deals, Woot offers the Sennheiser HD 518 Over-The-Ear Audiophile Headphones for $54.99 plus $5 for shipping. That's $10 under our mention from two weeks ago and the lowest total price we've seen. (It's a current low by $19, although most merchants charge $130.) These open-back headphones feature a frequency response of 14Hz to 26KHz, Duofol diaphragms, and 10-foot cord. Deal ends today.