I have been on the hunt for the super fine grind vermiculite for several weeks now so I can grow super beets. Well, the hunt is over and I wanted to share what I have found to others that might be having the same issues. I just purchased 2.5 gals of this so I'll update post when it arrives. Here is the link to the website https://orchidsupplystore.com/. It was only $43 and they have FREE shipping in the US except for the West Coast (read their free shipping policy for more info). This ships from Georgia either UPS or USPS. Website also states they will soon be offering wholesale accounts if anyone might be interested in bulk buying.