Can you get insurance for car hire cheaper than the one offered by the car rental company?

I visit Canada a lot, and love to hire cars from the aiport. I am gettting sick of paying over the odds for comprehensive insurance though. The rental company asked for 100$ for 3 day cover for a Yaris. They also said that the law in Ontario says that I will need to pay for [...] http://bit.ly/lNTHfN