Hi Gang, I can only second the frustration voiced by John Lonsdale. I cannot find good perlite, and a search for pumice revealed no suppliers within 200 miles of Houston, TX area. Neither the bonsai society nor the various cactus societies had good leads. I've given up on finding good perlite (or pumice), and have started using substitutes; I don't know if they are the best, but they are the best in terms of availability and my willingness to spend money. I use scoria (lava rock such as is used for landscaping) and Styrofoam peanuts. Both have drawbacks and benefits for me. Styrofoam peanuts are essentially free for me from my workplace. Because it is so rainy here, I plant cacti, some bulbs, and many agaves, etc., directly in scoria. I fill the container with scoria, or a mix of scoria and Styrofoam peanuts. Then, I pour a soil mix over the chunks. Sometimes, the soil mix is only 10-15% organic matter, so the whole affair is really 100% scoria (by volume), with other materials filling some of the interstices. Along with fungicides, extra water in dry periods, and other measures, this seems to satisfy many xeric plants. The whole perlite size-reduction issue is perplexing. I wonder if we plant growers who have noticed the difference just don't provide a large enough market for the vendors. I've tried some other possible subsitutes such as Turface, and find that expanded clays hold too much water. Drystall is one option (horse bedding material made from volcanic aggregates), but it is apparently not offered in this area. Cordially, Joe