Ceramic heat emitters are found in the reptile section of most pet shops. They are white discs with a socket on the end. And yes they will fit the lamp you already have, just be sure to check the wattage on the disc package so you don't get one that is too big for your lamp.

Sphagnum moss can be found in garden centers or arts and crafts stores. The stuff from garden centers CAN have bugs and stuff in it, unless you get the smaller sealed packages.

Gale