I’ve been feeding my Random Orbital Sander a steady diet of varying brands of 5” sanding discs. I’ve tried Shopsmith, Diabolo, Craftsman, and Norton ProSand blue discs. I’m not totally pleased with any of them. Which brand(s) do you prefer, and where do you order them from? Russel Brown prefers Norton sandpaper, but the blue stuff I can get at my local lumber yard doesn't last very long. What do you use, and where do you buy it?