If  you  draw  a blank (pun here?) on  your  roll paper source, I 
suggest you contact Dan Wilke, the auction man  at QRS, not  with 
regard to  the paper QRS  is selling in small and expensive lots, 
but in regard to his activity at  the Herschell Carrousel Factory 
Museum.  He  and  a group of others have been involved in getting 
the Wurlitzer roll-making equipment purchased by  the museum last 
year set  up  and running to produce band organ rolls.  Not  that 
you necessarily need paper of  the same quality as  ba band organ 
roll paper for indoor piano use,  but  Dan should know where bulk 
paper can  be bought.  Then  that paper can quickly and easily be 
trimmed to size on the Wurlitzer paper trimmer, which is  one  of 
the machine acquired by  the museum.  It  is working, I  am told. 
Most perforators I  have seen do  not  use pre-trimmed paper, but 
trim  as  they  perforate.   Wurlitzer's  perforators  were   the 
exception;  they  did  use pre-trimmed paper.   Hence Wurlitzer's 
ownership of the paper slitter.  I'm not what advantage Wurlitzer 
saw in using pre-trimmed paper.  I  am told they had to shut down 
their roll department when  the humidity in  North Tonawanda rose 
too high.  But on  the other hand, I suppose that if they had run 
trim-as-you-perforate machines and just kept  on,  no matter what 
the humidity, they would have  sold  some rolls that  would track 
poorly once they were in use under normal conditions of humidity. 

Anyway, as a last resort, I'd give Dan a ring at QRS and tell him 
what you need.