I think you might have better luck referring to it as "food grade DE"; and be sure to tell them you don't want the swimming pool kind. I got "huh???" when I asked for it at the bigger stores, including TSC, but we live in a small town and our local feed mill knew what it was. They didn't have it in stock but said they could probably order it in a 50 lb bag. I bought it last at www.hoeggergoatsupply.com. It's awesome stuff; we put some on our ferret and haven't seen him scratch once since we put it on. Same with the chickens for bugs but you have to get them to dust in it every day.