I found the Stevia in at least 2 forms. One form was just the raw, powdered herb found in bulk at Mother's Market. It's greenish. They are doing away with the bulk herbs though.
Secondly, I found the Stevia in a container, much like sugar, sold as a Sugar substitute. It was in a different part of the store altogether. I opted for the powdered herb because I do not know exactly how they process the container stuff. I'm suspicious of heating the herb, though I know many don't care about this.