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Walmart [walmart.com] has Cra-Z-Art Washable Sidewalk Chalk, 32 Count, 12 Assorted Colors for $ 2.97. Shipping is free w/ Walmart+ (free trial available [walmart.com]) or on orders $ 35+

Product Description from Store
Bringing outdoor fun to everyone is easy with this washable sidewalk chalk from Cra-Z-Art! Featuring a new, less breakable design, this is the perfect chalk for all your sidewalk creations. Have fun outside decorating sidewalks and other hard surfaces, or on chalk specific surfaces such as chalk paint walls, chalkboards, and easels. Create memories making hopscotches, chalk bullseye, 4 square mazes, sidewalk twister, tic-tac-toe, and more! Cra-Z-Art chalk is long-lasting, washable, non-toxic, and a whole lot of fun! Comes in a durable, reusable box with a carrying handle for storage. Recommended for ages 4 and up.