You can also get an Intel n100 mini PC very cheap. Sub $200. I got one on a sale for $160. Easy to upgrade you'll need to upgrade a drive.
I add this to the good advise on using an old desktop. The one advantage for a cheap mini pc, the n100 is a 6watt part. Whole thing should run well under 15w vs some old PC or laptops which will likely draw 3x or more.
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