How about this chap from Reaper?
http://www.reapermini.com/OnlineStore/gorgon/latest/03208
The Brass Bull there is in metal, BUT is also coming out in the new Bones release .. so should be cheaper.
Or something like this DDM miniature..
http://www.coolstuffinc.com/p/125934
(sorry.. not sure how to link just images)
Also on CSI, there is a product called "Bull" from Miniatures Factory (prepainted stuff).. no picture, but there is a text of "Bull miniature, mounted on 50mm base. Pre-painted and ready to use in your adventures"