Here is something else Pinterest told me I “must have”! I followed the link and looks like Blendermada does have a free materials database from what I can tell; HOWEVER, I didn’t browse around a lot to see everything they have. It does look like it is a donation site from the ABOUT section, where donations are to keep the site up and running.
Here’s the link if interested. http://blendermada.com/ You will need to do your own research. I am just posting this because it might be of interest to others. If you check it out, maybe post any comments of your experience of what you find as a reply for others. Thanks!