Massdrop offers the S.M.S.L. T1 DAC / Tube Headphone Amp for $149.99 with free shipping. That's the lowest price we could find by $200. Deal ends December 9. Features include:
USB, optical, coaxial, and analog inputs
118 dB dynamic range
asynchronous USB transmission
PCM and DSD playback support
Note: It's expected to ship on January 19, 2019.
Reviewing this critical insurance policy takes a little effort, but it pays off big.