Found these hammers in the tool section at my local Home Depot store. My store, and most stores in the area, appear to have plenty in stock according to Brickseek. As always, Home Depot clearance deals are B&M only and YMMV.
Hart 21 oz. Milled Face Steel Framing Hammer HH21SCM $6.00
Link (for product information and reference only):
https://www.homedepot.c
Brickseek link for local inventory
https://brickseek.com/home-depot-…=202216898
Hart 20 oz. Smooth Face Steel Hammer HH20SCSS $6.20
Link (for product information and reference only):
https://www.homedepot.c
Brickseek link for local inventory
https://brickseek.com/home-depot-…=204063640