It may vary with Home Depot location.
Home Depot used to be the home center that carried Estwing.
Lowes either carried imports, Kobalt, Plumb, and then later, Vaughan.
Then Lowes had a large sign out front advertising they were now carrying Estwing.
So Lowes had a small variety of both Estwing, and Vaughan, and other brands.
Home Depot has less Estwing now, and I think they must have stopped carrying the Estwing Sure Strike line of imported hammers.
I honestly wouldn’t be surprised if Home Depot is just looking for better wholesale costs simply to offset theft, since hammers are fairly easy to steal, either by concealing the hammer, or just walking out with it.
What employee wants to stop a shoplifter carrying a hammer or hatchet?
The other thing is that Home Depot has a habit of switching around suppliers and brands every several years or do, especially with hand tools.