5" 500-1000 Grit Sanding Disks wanted

[Prater]

Before I have to buy a box of sanding disks that may never get used again I thought I would check here and see if anyone had some disks the would like to sell.  Looking for 500 to 1000 grit for my Pro 5 sander.  I am doing Gel Coat and paint repair on my fiberglass boat.  Thanks...