I recall reading about someone searching for new piano roll boxes at
a reasonable price.  I gave them a link to this site as you can buy
various sizes of cardboard boxes at very reasonable prices especially
if you have tons of rolls without boxes or torn boxes:

  http://www.tripack.com/category_s/1847.htm 

I also found this site which produced boxes especially for piano rolls.
I'm sure there are many other sites for cardboard boxes of the correct
size.

  http://www.universityproducts.com/cart.php?m=product_list&c=2181 
  2-piece telescoping box, tan, metal edge, 2"W x 12.25"L x 2"D

Plus you _can_ fold your own boxes from sheets of cardboard.

Candy Hawblitz