First off, not to be biased against anyone else, but this stuff is big and it would be probably expensive to ship.
I am looking for someone in the Toronto or GTA area that would be interested in free (yep FREE) diorama supplies that I have accumulated over the years. THere is all sorts of stuff here, from raw building materials, casting resin, plaster, celluclay, different types of rocks, earth, etc, foliage, shrubs, different wood, etc.
The only stipulation is you gotta take all of it. There is a good sized box of stuff. You can come pick up, or we can meet halfway.
If anyone is interested, contact me at zzoranovic_at_yahoo.com (replace "_at_" with an @)