You might need to order it by mail.

I appreciate the reply and learning a bit more about the site see you've participated in some discussions re: diatomaceous earth. If you're willing, I'd appreciate the benefit of your knowledge on my intended use for the DE. We have two dogs and believe we have ticks in our yard. Not surprising since we hike frequently and can never remove ALL ticks. Ugh! We live in the suburbs, have a wonderful garden... we have quite a few critters that frequent the yard as well as call it home... birds, squirrels, toads, earthworms... we applied nematodes this spring to help with the flea population we believe exists as a result of the numerous squirrels... my questions, will we be doing more harm than good (to our general insect population) by spreading DE? Will the DE destroy the nematodes?

It's my understanding that DE will not harm nematodes, earthworms, or even slugs. Whether or not it help with fleas in your yard, I can't say. It is reported to control them in your carpets, etc.