I take it you have installed the full set of templates provided with the product (either from the product disk or download)?
Muvipix have additional templates. There are a few free ones (Free Stuff) more for subscribers (Subscriber Downloads).
Insanity is hereditary, you get it from your children
Welcome to the forum.
When you say "templates," exactly what are you referring to?
As Neale points out, there are Title Templates, Menu Sets, Themes/Instant Movie Templates, etc., in the Additional Functional Content (separate install from either the media, or from a separate download file), plus similar at Muvipix. However, I wonder if that is exactly what you are seeking. A bit more about what you need would probably be useful.
Good luck with your Projects, and please let us know just a bit more.