Looking for 3d files

[Koalas]

Hi,

Finally I decided to get the software Solidedge to creat my 3D sketches and modeles.
I'm asking myself if somebody knows where I could find 3D parts which are already done and sheared on the net ? Like a data base.
It's not that I'm lazy but I'm working for a technical center and it's always nice to show different kind of parts on the market to the public.

Thanks for your help

Cédric