Adorama offers the Audio-Technica ATH-M50x Professional Studio Monitor Headphones in Black, model no. ATH-M50X, bundled with the FiiO E17K Alpen 2 USB DAC Headphone Amplifier, model no. E17K, for $199.99 with free shipping. That's $96 under the lowest total price we could find for these items purchased separately elsewhere. The headphones feature a 15Hz to 28kHz frequency response, 45mm neodymium drivers, swivel earcups, a padded headband, and three detachable cables. The amplifier features a 20Hz to 20kHz frequency response, 96 kHz/32bit USB DAC, and 3.5mm and S/PDIF inputs.

Also available is the Audio-Technica Monitor Headphones, model no. ATH-M70X, bundled with the FiiO E17K Alpen 2 USB DAC Headphone Amplifier, model no. E17K, for $299 with free shipping. That's $127 under the lowest total price we could find for these items purchased separately elsewhere. These items share the same features as above, but the headphones instead have a 5Hz to 40kHz frequency response.