For Dave:

Check with your local cabinetmakers and see if they have any old widebelt sander belts they want to get rid of, or haven't thrown away yet. Most are cloth backed and durable, and even in the little sander I have the belts are 37" wide, and 60" long. I burn through quite a few when busy, they get knicked up, or a spot is bad and they're junk, but there's still plenty of abrasive left on them.
Lately my made in Tawain piece O' crap sander has been failing in the tracking duties and ramming the belts off the edge, destroying the edge of some brand new $50 belts.