A fifty pound sack o' sand costs $2.98 at Lowe's. That's pretty darned cheap. I usually put some in a litter box type pan in the covered part of the run for dust baths, and scratching, for the grown up chickens, to use when the rest of the run is icky from rain. Then toss the rest of the sand...
Once mine were more than a week old, I started with simple treats: warm mash of their crumbles every day, some small mealworms every few days, and some shredded mozzarella cheese every few days. (I chose the shredded cheese because they were 'small worm-sized' bits. Nothing too long.... )...