They just screw into place so I'd imagine that they can be replaced. I haven't seen the ceramic sockets on their own for sale, but that doesn't mean they aren't out there. I use Bayco brooder lamps from the local farm store (~$8 for a new one) so that's probably where I'd start to look for a replacement socket, in their hardware department. Generally, avoiding the reptile specific brands yields a better (and cheaper) product.