I am going to take Diesel300's advice and call a garage door company to come perform the repair.

I checked Home Depot, Lowes and Ace Hardware and none of them carry much in the way of replacement cables. Probably for a reason........just checked a review of a cable on amazon.com and the reviewer said the torsion springs can kill you.

I'm used to fixing and repairing most things around the house but in this case, it appears Diesel300 is correct. Better to pay the repair man and live another day......