For smaller quantities (11 oz to 10 lbs), major e-commerce platforms offer crushed, ground, or whole shells.
If you need walnut shell "grit" for polishing metal or water filtration, specialized industrial suppliers offer bags ranging from 10 lbs to 1-ton "jumbo" bags. Walnut Shell Blasting Media Grit - Kramer Industries where to buy walnut shells
Often lists unique natural handmade ornaments and bulk lots of shell pieces. For smaller quantities (11 oz to 10 lbs),
Ideal for finding ground walnut shell fillers for pincushions and crushed walnut shell bedding for reptiles. major e-commerce platforms offer crushed