Since I've been old enough to drive, I've bought all my tires at Discount Tire. Their price has never been beaten between several competitors and they include free rotations and tire pressure checks simply for buying tires there. I have never had a negative experience with any of their staff.
My most recent experience was me noticing my tire going flat overnight in the garage, had the initial "oh god, how much is this going to cost" moment and changed my tire. Took it to Discount and they fixed it, no charge, no fees, fast service, just a "thanks for coming by, see you again soon!" from yet another friendly Discount tire employee.