Any diveshop will sell him a case, but would you trust your $650 piece of emergency gear to a generic case that wasn't certified by ACR? That case better be really good, lots of pressure at 200'. Who's going to pay for the replacement when it proves to be not quite waterproof. I'm not saying that dive shops can't come up with a container, but if DLR routinely does those dives, then he's well aware of their limitations.