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Menards has 30 packs of 5" 8-Hole Hook & Loop Sanding Discs for $ 0.99 after $ 7 rebate. These are their generic house brand, but for sandpaper they work just fine. Especially for a dollar (assuming you frequent Menards). Used with orbital palm sanders.

Grits available: 40, 80, 120, 180 & 220