I've never bothered trying to find leonardite, lignite, pumice, or any of the other items you listed since peat is so easy to find and so cheap! I don't think there would be much advantage one over the other especially once you figure in the time it would take to locate them and possibly have them shipped. I have used Laterite and probably never will again. Way too messy for my tastes. Most Wal Marts have Schultz Canadian Sphagnum Peat Moss on their shelves this time of year and it is very easy to find a Wal Mart
