The estimates that are available for Canada are not great. We don't have gold standard science at present, so they range from $1 billion to $9 billion, depending on which study you look at.
In using studies that have been done in the United States about the effect of getting access to preventative medicines for patients insured in the U.S., they actually find that you save as much money in the rest of the system as you spend on the coverage. That would also put this in the range of billions of dollars. We're not talking about small amounts of money in terms of health system savings, or at least, in reality, it's reduced pressure on an already overburdened health system.