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Belagerent
I imagine something like this would do the job
https://www.amazon.co.uk/Universal-MAINS-POWER-ADAPTOR-300MA/dp/B003BEZ7HI
You might be able to get a cheaper one with the correct tip if you can do some measuring. It's a positive inner and negative outer that's required.
The actual model you want is SH-3.6V300 but I suspect you'll struggle finding that.