I just found the audio amps for the 3V PS/2 boards on AliExpress, with shipping they were less than $1/ea. I have a PS/2 3V board with a dead amp, and I just used my last one, so I'll see if these are actually any good. They are the TPA2000D1PWR, but the difference between the TPA2000D1PW and the TPA2000D1PWR appears to just be the packaging quantity according to the data sheet.
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