Adorama Camera via Newegg offers the Sennheiser HD 650 Over-Ear Headphones bundled with the Blue Microphones Yeti Blackout Edition USB Microphone and the FiiO E18 Kunlun USB DAC / Amplifier for Android Smartphones for $539.99 with free shipping. That's $92 under the lowest total price we could find for these items purchased separately elsewhere, although we saw this bundle for $30 less in May.
The headphones feature a 10Hz to 39.5kHz frequency response, 300-ohm impedance, detachable cable, and aluminum voice coils. The microphone features three condenser capsules, four patterns, gain control, a mute button, and headphone output. The E18 DAC / amplifier also functions as a power bank and features a 20Hz to 20KHz frequency response and rechargeable battery with up to 25 hours of run-time per charge.