Sonic Electronix offers the Blue Mo-Fi Headphones with Built-In Audiophile Grade Amplifier for $259.95. Coupon code "REBATE100" cuts it to $254.95. With free shipping, that's the lowest total price we could find by $95. They feature 50mm drivers, adjustable tension and suspension, passive, active and enhanced bass modes, a rechargeable battery with 12 hours of play time, 15Hz to 20kHz frequency response, and 42 ohms impedance.