Try Cable Company. They have the biggest selection of those kinds of products.
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My Quicksilver has stayed fresh for over six years, thus far. The trick is sealing and keeping the small container airtight, with electrical tape, around it's circumference. I also keep my complete kit in a vacuum seal bag(air removed). These guys may be able to help, with info on the products: (http://www.asi-tek.com/xtreme1.html)