you could ask kobo if they have spare ones
or you could buy one with a broken display I guess
I wouldn't go anywhere near water with my H2O but then I know it's not waterproof because I cut a hole in the back
my mother has another one and it's not waterproof either - the front bezel lifted off in one corner when clipping it into its protective fintie case
basically this waterproof business is anything but trustworthy. avoid water or put it in a waterproof bag