BuyDig offers the Beyerdynamic Headphone Amplifier, model no. A20, for $299. Coupon code "DIGTURKEY5" cuts it to $294. With free shipping, that's $95 under our mention from last Black Friday, the best price we've seen, and a low by $85. It features an ALPS potentiometer volume control, high-gain RCA input, hard-wired RCA output, two stereo 1/4" headphone outputs, brushed aluminum housing, and 10Hz to 100kHz frequency response range.