1.Call 1-800-The-Book and go digital products from the prompts then Nook Color.
You must have your serial number and the email you registered your Nook with. When you talk to a representative tell them you need a replacement cable for your Nook Color. After you give them your information they will ship you a new one completely free.
2. The fastest way is to go to or call your local Barnes & Noble and tell them you heard that if you bring a broken Nook Color cable in they could replace it for free.
Both methods worked for me but I'm 100% sure method one should work if and when you need a new cable.
Hope this helps everyone.