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Amazon [amazon.com] has DEWALT Flap Disc, Zirconia, 4-1/2-Inches x 7/8-Inches, 60-Grit (DW8308) for $ 5.38
Shipping is free with Prime or on orders $ 25+

Also Available:[LIST][*]80-Grit DEWALT Flap Disc, Zirconia, 4-1/2-Inch x 7/8-Inch [amazon.com] (DW8309) $ 5.99