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

For smaller quantities (11 oz to 10 lbs), major e-commerce platforms offer crushed, ground, or whole shells.

Ideal for finding ground walnut shell fillers for pincushions and crushed walnut shell bedding for reptiles.

A great source for organic walnut shell halves used in ornaments and natural art supplies.

Walnut shells are a versatile resource available through various channels depending on whether you need them for crafting, industrial sandblasting, or gardening.

Often lists unique natural handmade ornaments and bulk lots of shell pieces.