Archimago's Musings: MEASUREMENTS: Topping D10s - an inexpensive high performance basic USB DAC with S/PDIF outs. And on "perceptibly perfect" DACs.
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
iFi Audio NEO iDSD Desktop USB DAC/preamp/headphone amp with Bluetooth® at Crutchfield
ULTRA CHEAP CHI-FI DAC-AMP MINI REVIEWS: Absurdly inexpensive audio solution – No Borders Audiophile
Ztella Integrated USB DAC Amp Cable Review: Tantalizing Audiophile Sound For Your Smartphone! - HIFI Trends
The Best USB DACs • (top picks and comprehensive buying guide )
Topping D90 MQA Review – Majestic, Quick, Accurate - Soundnews
Creative Sound Blaster X3 USB DAC and Amp with Super X-Fi for PC/Mac - Newegg.com
Fx Audio Dac X3 Pro | Fx Audio Usb Dac | Fx Audio Decode | Fx Audio Dac 3 - Digital-to-analog Converter (dac) - Aliexpress