JSand4325,
while i can't speak for THX there are many free shaders avaliable on the internet such as this site at highend3d:

https://www.highend3d.com/maya/shaders/

--
the simplest way to create metal in maya is to assign a phong E material to an object however to get a really realistic metal you often have to tamper with maya's default shaders so maybe downloading one would be the best method if your unfamiliar with maya's shading network capabilities
(its a jungle :headbang

hope that helps