Someone was talking about these on the forums, so I thought I'd snap some pictures. The Dinosaur - 100 Million Years Ago series can be found in the Yankee Dollar chain of dollar stores, and you get three plastic Undead dinosaurs per pack.
The pack I grabbed comes with a brontosaurus, stegosaurus, and pterodon (25mm figure thrown in to show size):
The models look to be cast in tan plastic and then given the equivalent of a brown dip.
The pterodon stands on his feet (connected by a base) and his tail. If you decide to turn him into a flying dinosaur, I think you'll want to repose the head and possibly the tail.