Lowes sells "play sand" near their cement. (Its at the far end of my store) Wood ashes and sand would make for one happy flock. Don't know if you saw my post regarding cleaning the sand out of the big coop, intending to clear it out of the small side too. I didn't clear the sand out of the small side because 12 birds were in there dust bathing. They looked like they were in heaven, dust bathing in the middle of winter.