Yesterday I bought the Extreme PBR 2.0 addon for Blender. It only costs like 35 USD and it has 20% discount this week (couponcode 'cgmatter'). It includes something like 600 PBR materials which you can also use in Sketchup/Enscape. Everything is nicely organized in folders. I was pleasantly surprised and I am very glad I bought it. Below some examples (sketchup/enscape). Thought I would share it.
Below the complete list of types of materials and as example the bricks TH folder.