Confession: I recently bought a $150 amp (with beefed up power supply, less otherwise) and am using in a desktop system while working from home. This is my second Fosi amp. It is very well reviewed and is documented independently as measuring very well and it sounds it at least for this application which is granted less challenging than running a full range traditional full size system in most rooms.
My other older Fosi amp that cost even less does an exceptional job driving a pair of KEF ls50s in a fairly large room, a task I have seen other "high end" amps fail at miserably.
These are my third and fourth systems. Number 1 and 2 are still much more costly, but I have been successful downsizing all around in recent years accordingly as a result of not being afraid to first try less expensive and easily returnable things that have received good press but do not necessarily have the high end audio industry "blessing". Meaning I am less prone to simply throw money at the problem than in past years, which is a positive development.