Build Your Own Professional-Grade Audio Amp on the Sort of Cheap - IEEE Spectrum
AMP-150 AE Integrated Amplifier
Amazon.com: Fosi Audio TB10A 2 Channel Stereo Audio Amplifier Receiver Mini Hi-Fi Class D Integrated Amp 2.0CH for Home Speakers 100W x 2 with Bass and Treble Control TPA3116(with Power Supply) :
Z40+ Integrated Amplifier - Vacuum Tube Integrated Amp by Linear Tube Audio