Amazon.com: SHANLING UA1S Portable Headphone Amplifier,Tiny USB Amp/DAC with 3.5mm Jack,ES9219C DAC,Balanced Hi-Res Support 32bit/384kHz and DSD256,Lossless for Phone/Player/Nintendo Switch/Laptop/PC (Black) : Electronics
Best Portable USB DACs of 2022 - Moon Audio
Amazon.com: ILIWIWY Hi-Fi Headphone Amplifier Buit-in Power Bank Portable 3.5mm Stereo Audio Out Powered by Lithium Battery Headset Support GAIN/BASS for Android phone/iPhone/iPad/MP3/MP4/Laptops and PCs, etc. : Electronics
iFi Audio hip-dac Portable USB DAC and headphone amplifier at Crutchfield
iFi Audio xDSD Portable USB DAC and headphone amplifier with Bluetooth® at Crutchfield
USB-C Audio Interface w/USBAdt | Saramonic
Portable Battery Powered Bluetooth ATPX USB DAC DSD Native DAC XMOS XU208 Asynchronous USB DAC Headphone Amplifier Sound Card _ - AliExpress Mobile
The 3 Best Portable Headphone Amps With Built-In DAC of 2023 | Reviews by Wirecutter