BuyDig offers the Audio-Technica Professional Studio Monitor Headphones, model no. ATH-M30x, for $49.99 with free shipping. That's tied with our mention from two weeks ago as the best price we've seen, and it's the lowest total price we could find by $19. They a feature 15Hz to 22kHz frequency response, 40mm drivers with neodymium magnets, 96 dB sensitivity, and collapsible design.