I am looking to buy Cardboard sheets. Almost like an unconstructed
box.
I am looking for the same kind of cardboard as wouuld be found in a
cardboard box, but instead of the whole thing assembled, I would like
to just order the "walls" by themselves. This may not make sense so I
will include the reason why.
I often send photo's through the mail and am dissatisfied with the
current "photo mailers" I beileve if I buy these, then I can place the
cardboard inserts, into a normal envelope, and they will not bend. A
cheap alternative. If you have any questions, I can clarify.
I would be looking for a size around 8" x 10".

Hello ,

Thank you for your question. 

Atlantic Supply sells both 8 1/2 by 11 and 11 by 17 sheets (which
could easily be cut in two) at:
http://www.atlanticpaperproducts.com/Products/Shipping_Supplies/flat_card.htm

BoxesBags.com has sheets in almost any size including 8x10:
http://www.papermart.com/setpage.asp?PAGE=26-0-10


One of these companies should be able to fill your need.

Search Strategy:

"cardboard sheets" +buy OR order


If a link above should fail to work or anything require further
explanation or research, please do post a Request for Clarification
prior to rating the answer and closing the question and I will be
pleased to assist further.

Regards,

-=clouseau=-