Paper Anyone?

Since graduation in December 2011 from the School of Design at NCSU I have been making many books.  Books for shows, to sell, the book challenge, etc.  Amazingly enough I have yet to buy paper for any of the books (most of which have blank paper in them) or book board for covers.  I have been using all the left over paper from the ridiculous number of half used sketch books I have (we had to buy a new sketch book every semester and normally for every class) and leftovers from project.  I've been re-purposing the covers of said sketch books as the covers for the new books.  I'm going to post when I have run out of paper.  I don't know about you, but I am quite curious to know how long all of this will last me.