I have been in contact with Archival Methods regarding storage boxes measuring 8"x18" for both negative and contact print storage.
See this link http://www.archivalmethods.com/Produ...&Productid=122 if you have an interest.
Minimum order is 100 boxes @ $28.80 per box plus shipping. Box is black metal edged and measures 1.5"H x 8"W x 18"L and has a drop front feature.
I'll start by committing to 10 boxes and organizing the logistics of the purchase, let's see if there is enough interest out there.