Adorama offers the FiiO E17 Alpen USB DAC Headphone Amplifier for $139. Coupon code "STREETFAIR" cuts it to $99.99. WIth free shipping, that's $9 under our mention from last summer and within $10 of the best price we've seen for this discontinued amplifier. The amplifier features a 10Hz to 100kHz frequency response, OLED display, 24-bit/96kHz USB DAC, mini USB, 3.5mm and S/PDIF inputs, gain controls, balance controls, and tone controls.

Also available is the Fiio E12 Mont Blanc Headphone Amplifier for $129 before the above coupon, $99.99 after. With free shipping, that's the lowest total price we could find by $29, although we saw it for about 50 cents less last month. (It's also within $10 of the best price we've seen.) The amplifier features a 10Hz to 100kHz frequency response, bass boost, and charging indicator.