Newegg offers the Sennheiser HD 518 Over-The-Ear Audiophile Headphones for the in-cart price of $54.95. With free shipping, that's $2 under our mention from last month and the lowest total price we've seen. (It's a current price low by $20.) These open-back headphones feature a frequency response of 14Hz to 26KHz, Duofol diaphragms, and 10-foot cord.