Is this close to what you need?
http://apps.webcreate.com/ecom/catalog/product_specific.cfm?ClientID=15&ProductID=24091
from Talas                      It says it is also available in rolls
 
Found by a web search using the terms
rolls of unbuffered folder stock
 
Barbara Hass, retired librarian
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In a message dated 5/29/2009 4:01:30 P.M. Mountain Daylight Time, [log in to unmask] writes:

Hi all,

 I am trying to find a source for rolls of unbuffered folder stock for rolled storage of blueprints. The buffered kind is readily available and fine for architectural drawings. But for blueprints the recommendation is unbuffered.

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