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I found mine at tractor supply- it is like a farming type of store like someone else said- but more towards the tractor/mechanical side. Not sure if it helps. I don't really know what you guys have over there
I am sure there are suppliers for sand blasting somewhere near you. I think #40 grit is too fine, and even #20 is quite fine. I am switching to to #12 on next tank. You may find it under a different brand name in your area. It could even be a different substance. Black blasting sands are generally some form of slag. The stuff I have is nickel slag.
I don't remember the number, but I have the medium grade ( 40 maybe) I think it's awesome!! I have no problems with it. I could see going larger but def not smaller.
#40 is quite fine, while #20 is the same grit size as PFS. Personally, I found the #20 quite fine, and opted for #12 on the second bag. Pert of the problem is the material is relatively light.