As one of its daily deals, Musician's Friend offers the AKG M80 MkII Semi-Open Studio Headphones for $29.99 with free shipping. That's tied with our mention from a month ago as the lowest total price we've seen. (It's the best deal today by $40.) They feature an 18Hz to 20kHz frequency response, 1.57" drivers, and leatherette ear pads. Deal ends today.