On this forum you can share links no problem. I was just on their site though and didn't see the free sample anywhere!
Doctor Zymes - 2oz. Samples
A product that eliminates Broad Mites, Russet Mites, Mites, Fungus Gnats, Root Aphids, Powdery Mildew, Organic, Non Toxic, Pesticide Free
www.doctorzymes.com