Assets, prefabs, fbx

I'm looking for decent assets, prefabs and fbx files for been used in Unity, any website where I can download them?
I've downloaded a couple from archive3d, but I've had the issue of most meshes having way too many poly, which is not good for been used in a game engine, also the object I've seen in archive3d are all static, I need some animations like a character walking, dancing, fighting, etc.
Thanks

 

you can buy them on the asset store, use maximo to buy such things and alike

if you are asking for places for free, then the number of places is very small as creating art takes time, animated art even more so talented artists naturally want to be compensated for their work