Amazon.com: 192kHz USB C to 3.5mm DAC Headphone Amplifier USB C DAC Converter Portable Headphone Amplifier Headphone Adapter Headphone Converter for Android 5.1 System Smartphone iPhone with iOS 10 or Later :
Amazon.com: Wireless Bluetooth 5.0 DAC Converter&Headphone Amplifier-192kHz HiFi Stereo Optical/PC-USB/Coaxial/BT to RCA 6.35mm Headphone Digital to Analog Converter for Home Audio with Volume Control(Silvery) : Electronics
Amazon.com: FiiO E10K USB DAC and Headphone Amplifier (Titanium) : Electronics
Amazon.com: Hifime 9018 USB DAC : Industrial & Scientific
Amazon.com: Fosi Audio DAC-Q5 USB DAC Desktop Headphone Amplifier Optical/Coaxial/USB to RCA/Headphone & Digital-to-Analog Converter, 24-bit/192kHz Mini Stereo Preamplifier (Silver) : Electronics
FiiO E17 Alpen Portable Headphone Amplifier USB DAC, http://www.amazon.com/dp/B0070UFMOW/ref=cm_sw_r_pi_awdm_9KNhub13ZM70W | Headphone amplifiers, Headphone, Usb
Amazon.com: FiiO M15 5.15inch 64G Android Hi-Res MP3/MP4 Music Player Dual AK4499EQ with HiFi Bluetooth CRS8675 5.0/aptX HD/LDAC/USB DAC /DSD512/MQA,WiFi/Spotify/Tidal/Amazon Music Support : Electronics
Amazon.com: iBasso DC05 Portable USB Dongle DAC, Green : Electronics
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Apple Music Lossless, Amazon Music HD, Spotify Premium, Tidal Masters – But Your Phone Doesn't Have a Headphone Jack? DAC Buying Guide! – SomeGadgetGuy
Amazon.com: Upgraded Hidizs S9 Pro USB-C Amp DAC Headphone Amplifier Portable Headphone Adapter Balanced and Single-Ended Hi-Res Compatible for iOS Android Windows (Silver) : Electronics
Amazon.com: Amazon Basics 96KHz DAC Digital Optical Coax to Analog RCA Audio Converter Adapter with Fiber and Coax Cable : Electronics
Amazon.com: HIDIZS S3 Portable Headphone Amp / USB C DAC / Audio Amplifier for Android / Windows / MacOSX System Smartphone Laptop (Black) : Electronics
THX's tiny Onyx USB-C DAC is $50 off at Amazon | Engadget