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Amazon [amazon.com] has 6-Count 4.67" x 9" 3M Sandpaper (03031, 180-Grit) on sale for $ 2.05. Shipping is free with Prime or $ 25+ orders.
Amazon [amazon.com] has 5-Count 4.67" x 9" 3M Sandpaper (03078, 320-Grit) on sale for $ 3. Shipping is free with Prime or $ 25+ orders.