This deal has ended.
For a limited time Tire Rack is offering up to $100 mail-in rebates with the purchase of four select tires. See here for details. The promotions vary slightly by manufacturer but include Goodyear, Dunlop and Yokohama. This is as much as 20-30% off, as the tires are well-priced and generally $300-$450 a set. Just so you know, The Tire Rack has a network of local auto stores they can ship to for installation.