I was recently given a used square airport extreme router by a friend. However, it is missing the power cord that attaches to the power supply (which I have). Where is a good place to purchase one of these? Does anyone have a reputable source for Apple parts? Do you think Fry's or Radio Shack would have a generic cord that will work? I would prefer to buy from a brick & mortar store if possible (in case the cord doesn't work), but will buy online if I have to. Thanks in advance.