Are you the one who have Casio Exilim EX-Z300 and looking for the underwater housing for it, here I have an advice for you. I found this Underwater Camera Case that compatible with Casio Exilim EX-Z300 and EX-Z250 digital camera. It able to work up to 5 meters of depth and with test, it could stand at 18 meters (56 feet) of depth. If you buy it at eBay, you can get handling necklace, zoom ring extender, UV coated view and instructions. For all those, you only have to pay $29.95.