I house 2 beardies together. For the longest time, I used ground walnut shells. I do not recommend this, as it is extremely dusty. As juveniles, they survived any possible ingestion and are doing just fine.

So when I made the switch, I read up on the dangers of sand. The Pet store sands are all crap and calcium sand was said to be the worst.
If you go with sand, the consensus was to use Children's Play sand. (4$ at Walmart).

The new thing is to use ceramic tiles.

So I did mine 75% tiles, 25% children's play sand from Walmart.