Where do they sell rock salt?!
Answers: ive checked walmart but they dont have it
try beveage centers or gourmet stores.
and supermarkets....look in the dry seasoning , herbs section...located on the bottom shelf..with Kosher salt, sea salt etc.
wal -mart has it but it is a seasonal item, for winter. check lowes or home depot.
im suprised walmart dont have it thats where ive bought it before. could be only a summer item... my guess would be try krogers.
Try your local grocer for it.
Hardware store.