Unity Assets Beyond The Asset Store

Of course, the Unity Asset Store is a phenomenal resource for small studios like ours, but sometimes we needs some obscure piece of art, sound effect, or music that is not in the store.  Recently, I found a great discussion in Unity3D Answers that provides and extensive list of free and paid sites supporting content for Unity.  

Note that a few of the links are dated, but it has been a useful site for our development work.