Despite Construct being mostly 2D, 3D models can still be handy. Animating a 3d model and rendering the results is usually easier than drawing the animation frame by frame. Unless you use something like Moho (now Anime Studio), that is.
Anyway, let's make a list of free 3d resources.
Here's one to get things going:
[url:a0wecwdf]http://free3dmodels.fleshsoft.eu/[/url:a0wecwdf] - a bunch of free Blender models.
Also, don't forget [url:a0wecwdf]http://turbosquid.com/[/url:a0wecwdf], it has quite a lot of free models too. Just set the maximum price to 0 in the search.