I had several Sorghum drums I bought at an auction. I sold em plenty cheap to another fella who missed seeing them sell. I think for maybe $15@
Anyway I do have several extra corn drums on hand too. You may want to make sure you get a late model drum that has the "fake" bumps in-between the holes. It made the drum run smoother as it didn't have time to bump up/down as much. I don't know if any of my extras has that or not but I think it might have.