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Bittawm is actually selling D3s for $2500 each right now with shipping included (reputable member in the computer hardware goods section). Just be warned these things (as do pretty much all miners these days) sound about as loud or louder than vacuum cleaners and you can really hear em. Spending a hundred bucks or so can get you some decent soundproofing, Philipma has a YouTube channel where he documents making some Avalon miners quieter. They went down to 60-63db or so iirc but still a little bit loud.
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How long would it take to get a ROI