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Amazon [amazon.com] has 4-1/2″ x 7/8″ Dewalt 120-Grit Zirconia Type 29 Angle Grinder Flap Disc (DW8310) on sale for $3.61. Shipping is free w/ Prime or on orders $35+.

Product Description from Store:[LIST][*]Model: DW8310[*]Disc diameter: 4.5″[*]Arbor size: 7/8″[*]Grit: 120 (Fine)[*]Grit material: Zirconia[*]Type: 29[*]Max RPM: 13,300[*]Compatible devices: Angle grinder[*]Compatible material: Metal