Where can I buy a waterproof camera?

Soon I will be swimming almost 24/7 for like a week with my family. I want to find a good but cheap waterproof camera so I can take pictures of us underwater. A camera that's in stock too. The camera I have now is a kodak. It was cheap but that's okay cuz it's not like I'm a big photographer. So if you could help me find a good but cheap waterproof camera (maybe kodak or whatever) I would greatly appreciate it! Some stores close to me are target, walmart, and best buy. Thanks! :)