Pull into a Discount Tire and ask them to check your air. They will do it. No appointment, no charge, nobody sells you anything.
Get a nail in your tire and bring it in. They will patch it. Free, if you bought the tires there.
Rotation and balance for the life of the tires. Also free.
Now consider that this company sells exactly one category of product, has more than 1,250 stores in 40 states, and has spent sixty-five years building all of it without ever selling a single car, oil change, brake job or alignment.
Every other survivor in automotive retail diversified. This one went the other way and got narrower.
There is a reason, and a good part of it is written into federal regulation.