There are cheap ways to organize your scrap paper too. I have mine sorted in three bins made by Iris that are often on sale at Michael's craft stores for less that $5.00 each.
I like them because the have a secure closure, and they stack nicely together with grooved bottoms and raised lids that help stabalize them. The three that I utilize for my scrap paper are used--> one for scraps of cardstock, one for scraps of pattern paper, and one for Stampin Up scraps. I pick up new ones as needed and use these not only for scraps of paper but also completed pages that are either waiting to go in my own personal scrapbooks or are waiting to be sold. I have one bin for "in progress" projects to keep all the pieces together. You'll see these on the closet shelves of the post regarding my new scrapbook room.