I'm sorry about the issue. Do you mean the USB printer cable for connecting the printer to the computer.
All USB printer cables are standard, i.e., any USB printer cable fit all printers.
What exactly did Best Buy say?
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You can get any printer USB cable from Best Buy and it will work. Or you can buy the printer USB cable online at the Amazon website below:
; (Note: the above USB printer cable will work with any printer, including yours. But at the above website, you can scroll down to the selection Compatible with:, and it shows your printer model MP830 there.)
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