Since you're in Australia, you might not have noticed, but there's been some excitement over the fact that Freestyle is selling Tri-X under their house brand name of "Arista Premium." It's available in 100-foot rolls for US$29.99. I don't know how international shipping to Australia and exchange rates would work out, but there's a chance that would be competitive for you. 36-exposure rolls cost $1.99, so the savings from the bulk stuff are pretty small, if you prefer buying pre-loaded cartridges.