Autozone has always been good to me. Whether it is for tire cleaner, oil, replacement bulbs or this time some coolant and radiator stop leak, they have always had what I needed.
I had signed up a few years ago for their rewards program, and got a small card to attach to my key chain. I hate putting them on my key chain though, and was advised that I could just provide my phone number to receive any awards. I got a coupon in the mail for a 20% discount, and used this for my purchase.
They are always quick to open a register so that you don't have to stand in line for very long. They have always been knowledgeable if I ever have a question pertaining to my car.