It's actually a bit cheaper on Petco if you're able to get it there. I get the 10 pound bag. If you wanted other options just in case I have this copy and paste list:

natural play/decorative sand, Natural aquarium sand, and Reptisand are just a few. You can use any aquarium or reptile sand that are mineral-free and undyed. And any chinchilla sand (not dust it's too powdery). Or children's play sand, but make sure it's non toxic. If you get play sand, most people like to bake it for a little to sanitize and sift out all the big pieces, but I've used Amazon play sand without baking and it was alright.

The aquarium sand the other commenter mentioned is linked to Petco, and if it's still on sale it's the same price for double the amount.

natural play/decorative sand, Natural aquarium sand, and Reptisand are just a few. You can use any aquarium or reptile sand that are mineral-free and undyed. And any chinchilla sand (not dust it's too powdery). Or children's play sand, but make sure it's non toxic. If you get play sand, most people like to bake it for a little to sanitize and sift out all the big pieces, but I've used Amazon play sand without baking and it was alright.

natural play/decorative sand, Natural aquarium sand, and Reptisand are just a few. You can use any aquarium or reptile sand that are mineral-free and undyed. And any chinchilla sand (not dust it's too powdery). The aquarium sand is the best deal right now. Reptisand might be on sale there too just make sure it's the white one and calcium free.