Power Cable for Deskjet 640 C printer

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Help! I have lost/mislaid the power cable that connects the printer to the mains. I have tried the Yellow Pages and made innumerable phone calls but no one has told me where to buy one, IN A SHOP and not oth Internet because it is too daunting. Please help me some one and please show me how to reply to comments/advice on this subject, because I am not very conversant with the Internet.