BuyDig offers the FiiO E17 USB DAC Headphone Amplifier for $138.95. Coupon code "AMP30" cuts it to $97.27. With free shipping, that's $13 under last week's mention and the lowest total price we've seen. (It's a current low by $35.) It features an OLED display, mini USB connectivity, 3.5mm and S/PDIF inputs, gain controls, balance controls, and tone controls.