I have a dell wyse 5070 with a j4105 cpu that runs home assistant with frigate and z2m around 3-5W with a bluetooth and zigbee stick attached. If more processing is needed it will boost to 15w for example during docker container updates, but it will also perform much better in these situations than the PI does.
It costed me ~85€ from a refurbish shop and even had 1 year warranty. It came with 4gb ram, 128gb ssd, power supply and case ofc. It was a no brainer at the time when just the PI4 alone was like 80€ for 4 gb ram version if you could find it in stock. And that didn't include case, power supply or sd card.