All you need to do is type in western digital external harddrive replacement cable, I don't think that bestbuy carries it but I found many on Amazon, any cable that fits will work but it may not have the speed of a 3.0 cable, if you have a 3.0 hookup on your computer replacement cords are cheap when i went to Amazon they started at about $ 10.00 for a replacement 3.0 cable, I might not have worded my search correctly on Bestbuy's site so you can check their but they are easy to find and in expensive.
Good luck