Skullduggery, a company that makes fossil replicas. They have a moderately priced trilobite fossil replica as well as cool stuff like a one-quarter scale tyrannaurus rex skull (drool).
Ray Troll is an Alaskan artist who has a penchant for trilobites, ancient sharks, dinosaurs as well as modern fish and wildlife. He is the illustrator of one of my favorite books, Dancing to The Fossil Record as well as my niece's favorite ABCs book Sharkabet.
Links & Pin Hobbies is the only place I've managed to find on the Net that sells plastic toys of "living" trilobites and other Cambrian Period animals.