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Couldn't find any cost estimate, but from <a href="https://openquantumdesign.org/the-quantum-computer" rel="nofollow">https://openquantumdesign.org/the-quantum-computer</a> (scroll down to "What's Inside") I'm guessing 100's of k$ for the bill of materials (let alone keeping the thing going.)<p>So the "you" in "your own" has to have pretty deep pockets...for a relatively low fidelity 30 qubit device.