What do you mean by wmv-files? You can get them from everywhere, just be more specific what kind wmv's.
I mean like music videos that are in the Windows Media Video format so that I can try to sync those vidoes to my cellphone. Any suggestions? I have a Samsung 950 if you wanna know what kind of cellphone I have.
There are no legal sites that let you download music videos, at least for free. So the only way is by p2p networks.