Do a Ebay search for Dell Wyze 5060. You can get one for about $30, they're fairly capable
small computers, come with 8 gigs of memory and a 64 gig ssd. They are passively cooled, no fan and use very little electricity.
They will run current linux fine. They will also run Win 10 fine but you will probably need to finegle more drive space in it, not hard but not totally straight forward either. I've got a 256 gig ssd in mine (it came with no drive when I got it about a year and a half ago). I couldn't resist a second one at the price they are now, it will be here tomorrow.
I think I have a actual use for it, though.
You either want to make sure it comes with a power supply or you have one, it uses the same 19v adapter with the 5.5 x 2.5 barrel connector that millions of laptops came with. If you get one the bios will have been factory reset, the default password is Fireport (with a capital F). The video on most is two display ports so plan accordingly. I already had display port to hdmi adapters.
These are small. This is a pic of my hand of the top of mine (yes, the pic looks like my hand is in front of it to create a false perspective but it's not).
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