I found them at Winco, which is a chain here in the west, mostly Idaho. I do make my own bread, cookies cake, etc, but with only 2 of us, it would take a while to use that much flour. I will grab some after thanksgiving if they're available. When you buy buckets or anything plastic to store food, make sure it is food grade. Much plastic is not, and can leach chemicals into food. Where can you find mylar bags?