If you need recordings of sound effects rather than spoken word, there are several ways to start. Try doing a keyword search on some of the following terms, limiting your search to material type "Spoken Word Recording":
Sounds [for recordings of "real" sounds from life]
Sound effects [for reproduced sounds]
Theaters -- Sound effects
...or any other term for which you'd like to find a sound, such as airplanes, cars, or clowns.
BGSU owns the 40-disc set, the BBC Sount Effects Library (MusicCD 05553-05592). These are royalty-free tracks that you can use in projects. Read more about the collection, or look at the complete index on the Sound Ideas site.