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DouglasHey everybody . . . we use http://www.gaylord.com/ for our supplies. They carry just about anything.
For a small space, like a safety deposit box, one of these http://www.gaylordmart.com/adblock.asp?abid=7133&sid=3C622AA661BC408E8B75D2BCB93DD4&search_by=desc&search_for=silica should suffice.
Good luck. They also have plenty of UV-blocking supplies as well.
Doug