I use mainly Klingspor gold disks as they cut well and last long. I also use their 1" rolls both the gold and regular. Klingspor has reasonable shipping costs and ships quickly.
Awhile back, I bought the Klingspor box of abrasives. The sandpaper was about 10" wide and grit from 40 to 220. I mount pieces on 1/4" MDF that are 12 x 18" and use it for flattening things.