I buy from well established companies that will stay in business for a while and provide great support.That has worked for me in every respect except with amplifiers. Clayton Audio is a USA-based company but really a one-man operation that handles requests but no longer seems to be in full scale production these days.
On the positive side, Wilson Shen is a great guy to work with and a very talented designer. After selling to go with well-regarded Class D amps, I ended up going back to Clayton amps and commissioning Wilson to rebuild/upgrade the amps I was able to find and purchase. The guy who purchased my original Claytons remains very happy with them. Before finding another pair of Claytons, I tried a number of well-reviewed amplifiers but none that sounded so much like real music to me.