Stuffing in the grocery store is often found in the pantry section or in the same aisle as gravy mixes and instant potatoes.
In Walmart the stuffing is located in the grocery department in the same aisle as the instant potatoes and the gravy.
If you can't find the stuffing in the grocery store or Walmart you can ask an employee to show you where it is in their store.
Stuffing is made with stale white bread, and often studded with bits of sausage or plump oysters, and stuffed inside a turkey.
Dressing is made with cornbread, and is baked in a pan instead of inside the bird.
Stove Top stuffing is a totally distinct entity.