Go here and look at the three connectors over to the far right.
http://pinouts.ru/Slots/USB_pinout.shtml
Does it look like the bottom of the three?
That is a standard USB mini connector and the other side would be A (that plugs in the pc)
Those available anywhere or if you have bought any other USB device (digi cam, mp3 player, razr phone you would have gotten one with it.