Un'Goro Soil  

These always seem much easier to find when you aren't actually looking for them. I've needed them now for two druid quests, and it's very annoying running all over the place trying to find them. I expect that once I don't need them for anything, they will be everywhere. A few places that had good concentrations of dirt piles:

- Around Fire Plume Ridge
- At the base of trees*

*Sometimes these are hard to see because of all the roots & ferns, etc.

There were a few random dirt piles in the middle of nowhere, but those are easy to spot while running from tree to tree.

Anyway, I would really have much preferred to just buy them on AH but no one was selling.

25, 33 x 2
38, 39 x 3

These could repawn in different areas. I found them around the bases of the very large tress, about every 3rd tree offered the dark brown pile at its base.

44, 33 - 4 in pile

dunno about selling price but i would keep them as they are 4 a quest in darnasus