BuyDig via eBay offers the Audio-Technica ATH-M50x Professional Studio Monitor Headphones in Black or White bundled with the FiiO A3 Headphone Amplifier for $139.99 with free shipping. That's $47 under the best price we could find for these items separately elsewhere. The headphones feature a 15Hz to 28kHz frequency response, 45mm neodymium drivers, swivel earcups, padded headband, and three detachable cables. The amplifier features a 20Hz to 20kHz frequency response and 3.5mm input.