Most places that do sand blasting use a sand like product called "silica sand" it is glass beads, heavy equipment shops and large truck shops also use this product, if you were to take them a small container they may give you a couple of cups full, and also may charge you a small fee, but so worth a try, or ask a mechanic that you know - my husband worked in a truck shop, and that is how I know about it. I also have found it at "Michaels". I make an inside bag for my pincushions out of fine muslin to encase the silica sand and then put a pretty cover on the outside. Silica sand is washable, and also sharpens your pins and needles. Best of luck with your pincushions.