Northern Tool & Equipment has the 3-Pack of 6" Klutch 120 Grit Sanding Disks with Hook-and-Loop Backing for Angle Grinders on sale for $0.79. Shipping is free.
Product description:
The Klutch 6" 120 Grit Sanding Disks with Hook-and-Loop Backing are designed for use on angle grinders with 9000 max RPM. Package contains (3) 6" 120 grit disks.