It is not an easy thing to find, i will tell you that. I had a good one for several years but it broke not too long ago and no amount of gorilla glue seems to be able to bring it back. The top piece of the thing does not sit right on the flange anymore and the hinge just rusted right apart. it is a tricky hinge and a even trickier flange and what w/ jake being made at me for impuning his invention i am not in a good position to ask for his assistance. he has been mad for coming on a week altho i do hear quite a lot of hammering coming from over at his place so i know he is up to something.
anyways, i been looking here and there but nobody seems to sell butt sponge holders anymore, which is a real shame if you ask me.
While i am on the subject of bathrooms here is a picture of my bathroom sealing.