Buy Crayola® Washable Sidewalk Chalk (Box of 48) at S&S Worldwide
Amazon.com: ART BOXChalks - Assorted Colours (Pack of 50) : Office Products
Amazon.com: ArtCreativity Jumbo Sidewalk Chalk Set for Kids, Giant Box of 120 Colorful Chalk Pieces, Non-Toxic, Dust-Free, Washable Chalk in 10 Colors, For Driveway, Pavement, Outdoors, Great Arts & Crafts : Toys