So my puppies chewed up my power cord both sides, the part that plugs into the macbook and the extension cable. Apple sells these for $79.00. http://store.apple.com/us/product/MA538LL/B?fnode=MTY1NDEwMQ&mco=MTA4NDE2NDY I only need the end that goes into the macbook and can use an regular extension cord if I need too. Found a seller on amazon but too many bad reviews. So were can I get just the charger cable without the extension?