Kevin Carpenter, owner of Zilla, had a boatload of southdown available. I believe he's gotten rid of the unopened packages, but he had a huge barrel full of dry, used southdown. You might want to drop him a line. He's KevinC on RC.
There was a thread on here where some people were using pulverized limestone as a substrate.I beleive the brand name was pavestone,as far as I can remember they were having good success with it.
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