Having difficulty visualising the plug. One rarely needs to replace a plug. Do you just need a new Ethernet cable ? They are very common and any shop selling PC stuff should have them.
It's likely any dc power supply with universal connector adapters, the right voltage, and an equal or greater current would suffice. But your warranty could be compromised. Maybe best to wait.
But you could phone local PC shops and ask tomorrow morning if they have the real McCoy.
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