Beach Camera via Amazon offers the Audio-Technica ATH-M50x Professional Studio Monitor Headphones in Black or White bundled with the FiiO A3 Headphone Amplifier for $149.95 with free shipping. That's $55 under the lowest total price we could find for these items purchased separately elsewhere, although in April we saw this bundle for $20 less. The headphones feature a 15Hz to 28kHz frequency response, 45mm neodymium drivers, and include three detachable cables. The amplifier features a low/high gain toggle switch, 20Hz to 20kHz frequency response, and 1,400mAh rechargeable battery.