TEAC HA-P50 Portable headphone amplifier/USB DAC at Crutchfield
Cayin RU6 Portable USB DAC/Head-Amp Dongle
Amazon.com: HELM Audio Bolt DAC/AMP, USB-C Portable High-End DAC/Headphone Amplifier with MQA Playback. Mobile Studio Sound for Android, iOS and PC. USB-C to 3.5mm Audio, THX Certified : Electronics
Fiio E10k Type-c Usb Dac Amp Xmos Xuf208 Pcm5102 Decoding For Pc Computer Headset Power Amplifier Hifi Sound Card Mini Desktop - Headphone Amplifier - AliExpress
iFi Audio ZEN DAC V2 Desktop USB DAC and Headphone Amplifier | World Wide Stereo
iFi Audio ZEN Air DAC Hi-res Desktop USB DAC and Headphone Amp | World Wide Stereo
iFi audio ZEN Air USB DAC and Headphone Amplifier 311014-0002