As I said last month, you can get them very cheaply from AliExpress, although watch delivery charges and minimum order numbers.
Pictures from the listing I linked to. If you want to remake the end of your existing cable go for the ones like picture 1. I prefer to get the ones in the second picture and join the wires in heat-shrink butt connectors. You just reuse the outer casing from the existing plug rather than the generic two-pin casing they are supplied with.
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