From October 8th to December 2nd get $70 off a set of 4 safe Michelin Tires at Costco. This is an instant discount this year on tires, there is no MIR to wait for.

They also have an offer on for $50 off a set of 4 BF Goodrich  passenger or light truck tires.

Installation is $15 per tire, or $60 for all four (some people claim only being charged $15 for all four). The price quoted above excludes taxes as well as any provincial specific disposal fees. The prices includes free tire rotation for the life of the tires.

You can use the Costco website to enter the year, make & model of your car and find prices for tires for your vehicle (before discount).