Hi l8nite. I see that you're from the Bay Area. If you are looking for a quick way to do MTS, I'd recommend going to a local rock quarry and picking up a couple bags of dirt. If you go to a good one, you can find different types of dirt. I try to choose the ones that have higher clay content and less debris. Usually quarry dirt has been sitting out in the sun for long periods of time. I've used it (minimal washing) with great success. Good luck! Looking forward to seeing your progress.