I would really like to add some more sounds to my animations created in Maya. Even though I'm relatively new, I am finding the program addictive!

Does anyone know where I could possibly find sound (not really music, more sound effects and the like and preferably free ones!) files that I can download and which would be suitable to be imported into Maya?

Some help would be much appreciated, I can find sites with models, textures, scripts you name it, but I can't find any of these.