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Ouch: The Raspberry Pi 5 just hit an eye-watering $385
(www.pcworld.com)
This is a most excellent place for technology news and articles.
Used Mini PCs, brand name, like Lenovo tinys, are now my go to. Slightly larger, but orders of magnitude more capable, and often power sippy.
They still make use of desktop CPUs that can pull 120W when idling and up to 250W under heavy loads. So light on power? Maybe. But power sippy? Not against an M4 Mac, which can be as little as ⅙ as much under a similarly heavy load.