The shot normally comes with a $170 price tag, and is available to anyone aged 65 to 70.
More than 42,000 Ontarians are affected by the virus each year.
The painful rash can last for a month or more, and is often severe enough to interfere with day-to-day activities.
The Patients First Action Plan was first launched in September, with over 200-thousand vaccines already been handed out across the province.