Mr. Rex is free for photo ops.
But they do have an paid tour with more dinosaurs displayed (Mr. Rex’s Dinosaur adventure) but I elected to skip.
But if you feel you should support having a big, life sized T-Rex replica, with a grin like he got away with eating a tourist, for future generations to meet, there is a gift shop that probably pays rent, inside the Brontosaurus. And they are sympathic with Mr. Rex’s plight, despite the fact he may have eaten a tourist yesterday when no one was looking.
They do have Cabazon Dinosaur T-shirts, as gifts for the grandparents.