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I've successfully powered a Pi 3B+ using a cheap 12V 3A wall wart from aliexpress and a cheap buck converter from aliexpress. The 12V 3A provides for well above 3A when dialed down to 5.1V through the buck converter.
The most difficult part is soldering wire on to a USB plug.
https://www.aliexpress.com/item/33014935336.html
https://www.aliexpress.com/item/...
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