Where buy sand-like pebbles like AK's Boneyard dig site?

[lovetogowdw]

My boys LOVE to play at the dinosaur "dig site" in the AK's Boneyard play area. And I love that the "sand" is actually some sort of tiny pebbles that easily wipe off. I'd love to have that same type of faux sand for our home sand table this year. Anyone know where I might buy something similar?

 

[Gumbo4x4]

Try a large Nursery that has landscaping materials.