I am looking for a good source for drum sanders in different diameters as long as I can get them  for use in a drill press. I've only seen 3", are there any longer available.
Thanks
Terry

Terry, Three inch is the longest I've seen for a drill press. They are getting harder to find in my area. Something to due with suppliers.

If you consider getting away from the drill press I'd consider a spindle sander table. Grizzly.com has some good choices.
Ron

Try Lee Valley. They have them with rub collars.

Industrial Abrasives Company has a large variety of drum sanders.

Bingham Products has some.