Amazon [amazon.com] has the 12-Count Crayola White Chalk for $0.99. Shipping is free with Prime or $25+ orders.
Target [target.com] has the 12-Count Crayola White Chalk for $0.99. Select free retailer pickup the place accessible, or delivery is free with $35+ orders.
Durable Crayola Chalk Resists Breaking
Safe and Nontoxic, Ages 3 & Up