I've been a big proponent of Combat Abrasives because I think their AO belts are excellent and in bulk quantities of 48 are only $1.49 ea. I typically order 48 of 120, 220, 400, and 24 of 40 and 80 ceramic.
I can no longer recommend them because the last order I made they substituted random weight and brand belts for all my AO grits. The 120s are so curled I can't even use them on bevels. I complained and to their benefit they replied and have tried to make it right with some free belts and discounts, but if I can't trust that i'm going to get exactly what I ordered when I drop $500 on belts, i'm going to go elsewhere.
Back to Pop's more than likely.