Large fish cave?

[importracer]

I've got a large synodontis catfish (about 6" long) that needs a cave. He's been hanging out in one of those large size Cichlid Stones but he's outgrown it and they don't make larger ones.

Anyone know where I can get natural looking fish caves for fairly large fish? I've got about a third of my 125gallon tank to play with space-wise to fit something in.

If it can't be bought reasonably, anyone seen any good DIY solutions? Thanks.

A large clay pot burried halfway into the gravel will do...........Or, I have seen some plastic caves in the reptile department of a local store, some fit large lizards over a foot comfortably................