I would like to find a fabricator to use cardboard to create a castle
design. I perfer local in Az. however the cheaper it cost me the
better.. I need 4 boxes that are 3.5 ft high and 2 ft wide 2 ft long.
I need 4 seperate sheets that are 3 ft long and 3.5 ft high. They need
to use White Cardboard and I would like the outline of bricks on the
cardboard using black color. I would like to order 100, however I like
to get one shipped to me for inspection and then get cost on
creating,shipping and time to the order. I like to know what reduction
in cost I could realize in future shipments.

http://www.superpages.com/yellowpages/C-Cardboard/S-AZ/T-Phoenix/

They have all of that. 

www.baird-bartlett.com

www.papermart.com