As one of its daily deals, Musician's Friend offers the ART Voice Channel Tube Mic Preamp for the in-cart price of $299.99 with free shipping. That's the lowest total price we could find by $139. It features selectable plate voltage, variable input impedance, ADAT Lite-pipe, AES/EBU, S/PDIF, and TOSLink output, USB, and more. Deal ends today.