In the past, whenever I needed a specialized replacement cord (as an electrical engineer) I went to this company:
North American and International AC power cords and cord sets from... I have been able to find anything I ever looked for, and I see they have no minimum order. Another alternative is to find a local Goodwill or consignment store and browse through their older electronics (and hot plates and such). Old stuff sells so cheaply it's worth it just for the cord.
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