SMSL SA-98e Amp Power-Supply Advice

Honestly, I would check electronics retailers (Mauser, Digikey, etc.) first.

Open-Frame would not be ideal, I agree.

A quick search bought up three supplies (neither is cheap):
Meanwell GST220A36 would set you back $82
ETA-USA MTE200-36SX $143
TDK-Lambda TDM250PW360D $210

Looking at prices, I would try the amazon find you did earlier.

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