Where can people get a rainbow loom case?

It depends on where you live. I live in New Zealand and here, you can get it from Warehouse, Kmart, Farmers, Spotlight and other craft stores. In USA, you can get it from Michael's, Target, Walmart and other places. I'm not sure where you live, but I hope you live in one of those two countries!

Rainbow Loom cases are available on the official Rainbow Loom website (see link below,) on Amazon, and from most of the craft stores and specialty shops that carry the Rainbow Loom.