You can buy a dead-blow mallet, but making your own out of scrap wood is cheaper, relatively easy, and extremely more satisfying.
1 Lb. Neon Orange Dead Blow Hammer
Dead-blow hammer - Wikipedia
5 Handy Ways To Use Your Dead Blow Hammer - Popular Woodworking Guides
Different types of hammer and their uses : r/coolguides
Just finished a making a dead blow mallet that works with fluid dynamics! As far as I know its a first of its kind! I'm pretty proud of this one : r/woodworking
DIY Dead-blow hammer - 3D model by Mazay DIY on Thangs
Three Ways To Build A Wooden Mallet — 731 Woodworks, 52% OFF
Milwaukee 48 oz. Dead Blow Hammer 48-22-9151 - The Home Depot
DIY Dead-blow hammer - 3D model by Mazay DIY on Thangs