Among other things, silica gel is used for drying flowers to use in decorative dried flower arrangements. I buy it at Michael's, a chain of arts and crafts stores in the US. Just go to an arts and crafts store and ask if they have any of that stuff that's used for drying flowers. What I got came in a cylindrical container. In large red letters it says Flower Drying Art. In much smaller letters it says Flower Art Silica Gel.