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Are you sure you want a mini PC? You will need a display. If you carry a display around with you it’s just as awkward as a laptop. If you don’t carry a display around you won’t be able to use your computer on the go. You will also have to plug into walls or buy a battery pack that outputs the tight voltage.
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Supply chains for computers are opaque. You’d need to go inspect the factory yourself, basically. An alternative is to buy used, which slightly distances you from the consumption.
Personally I’d say to look into a used thinkpad. If you definitely want a mini PC, look into a used 1 liter business PC like the ThinkCentre M series. The slightly older models can be purchased on eBay for around $130.
You get more phone per phone