Much like the Michelin Tire Rebate mentioned in a previous post, Bridgestone is also offering a $70 rebate when you buy 4. You can get more ($120) if you open up a CNFA account and use that to make your purchase.
There's a decent list of tires to choose from that qualify for the $70 Pre-Paid Visa and there's a limit of 2 rewards per household. Costco and GM purchases are not valid. This offer ends September 30.