this idea from Martha Stewart Kids. Roll up prints and store them in labeled mailing tubes inside a cylindrical trash can (like this one from Umbra). Cardboard tubes aren't archival, so if you need to store something long-term, spring for archival tubes. These aren't too pricey at $4.50 each.
Good Questions: Suggestions for Inexpensive Framing Stores? How To: Start an Art Collection Problem Solver: Poster Hanger