I'm making my own worm castings now but really don't have enough yet for the soil amending that I wish to do so I needed to find a good source. I've used wiggle worm before and it's better than nothing but really it's not that hard to tell the diff between it and good homemade castings so I was hoping to find a better source. In the mean time, I was also looking for rock dust and someone recommended agrowinn - fertilizeronline.com - as i remember. Well, not only do they have rock dust at a reasonable price but they have organic worm castings from worms which have been fed rock dust. I purchased a bag of this as well and received it yesterday. The castings look very similar to what I make at home and much better looking than wiggle worm. Anyway, for those on the hunt for decent castings and rock dust - this looks like a good answer at a reasonable cost. Sorry, I meant to post this in the organic growing section not the journal part.