To reiterate what you said,The $120 gift card is the manufacture rebate. The Bridgestone website says “Eligible tires for the $120 reward: All Alenza™ products.”:
GET UP TO $150 BACK BY MAIL ON A BRIDGESTONE VISA® PREPAID CARD
You can also see the said rebate at Tire Rack website under Bridgestone Alenza AS Ultra 225/65R17 102H.
As I said earlier, you won’t be able to find Bridgestone Alenza AS Ultra at Discount Tire / America’s Tire website as it’s too new. You need to call or stop by a DT / AT store directly and ask them to order a set of Bridgestone Alenza AS Ultra 225/65R17 102H. They’ll order it and usually it takes a day. Don’t forget the price match with them.
I will go and ask American tires to order alenza and price match it with Costco. I don't have to ask about manufacturer rebate with American tires right ? After installation, I submit to bridge stone tires for this mail in rebate.
That means, I am getting 4 tires at 570$ prices ( Costco price ) - $120 = $450.
Installation charges extra .