BuyDig offers the Audio-Technica Professional Studio Monitor Headphones, model no. ATH-M30x, bundled with a FiiO E6 Portable Headphone Amplifier for $69 with free shipping. That's the lowest total price we could find for these items sold separately by $28, although we saw the headphones alone for $19 less three weeks ago. (Most stores currently charge $69 for the headphones alone.) The headphones feature 15Hz to 22kHz frequency response, 40mm drivers with neodymium magnets, 96 dB sensitivity, and collapsible design. The amplifier features a frequency response of 10Hz to 100KHz. Deal ends May 14.