I’m using sand for my chicks and they seem to be really enjoying it. It’s cheap, easy to clean, and doesn’t stink. The only downside to it is that they get sand in the waterer, so you’ve gotta go in a couple times a day to empty out the sand so they can drink again.
I used large flake shavings, which are less likely to be accidentally eaten, and covered them with paper towels for the first couple days while they learned what was and wasn't food.