You may want to check the Uline shipping supplies catalog. Also artist's supply shops that carry portfolio boxes. I have used both types to send prints back and forth with no problems. I have a Pelican rolling camera case and it is quite heavy so something along that line may be costly to ship along with the initial purchase price. Uline has weather proof shipping containers and ones for art work etc. Their catalog is over 500 pages (uline.com phone 1-800-295-5510)

http://www.jeffreyglasser.com/