Best or Cheapest place for 3m roloc discs?

http://www.thetoolwarehouse.net/c-302-1-to-4-disc-abrasives-roloc.aspx

2 pages, different vendors, varying quality. I've used off brand "roloc" buffing and sanding discs before, with varied (poor usually) results. usually the abrasive media detaches from the roloc plug, wasting the product ( fortunately, I wasn't the one who paid for those inferior items )
 
Ask your Snap On dealer, they are as cheap if not cheaper than the parts store.
 
Along the same lines, does anyone know where one would find some 120 grit aluminum oxide blasting media in western nc or charlotte? I can find coarser stuff at hf and northern but not 120. Maybe a body shop supply place?
 
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