I took this on Saturday September 14th, 2019 outside of Toronto (Ajax, Ontario) at an Esso station:
Regular 87 Octane - 114.4
Extra 89 Octane - 130.9
Supreme 91 Octane - 137.9
Supreme+ 93 Octane - 138.9
Those were the prices in CAD per liter of gasoline that day.