Will it be fun? Yes. Will it save you money or have the same technical qualities as a transparency or C-41 film? Not by a long shot.
My suggestion is simply to buy more than 10 sheets at a time. If most of that $50 - $60 is shipping charges, you are really paying a lot of money per sheet. However, with more sheets, the shipping would be a much smaller percentage of the total, thus lowering the cost per sheet. I would get at least 50 to 100 at a time if I was getting charged $35 shipping no matter how many I bought (and much more if I could afford it).
Is there not an Australian dealer of sheet films?
I was also planning on trying some E4/C22 dev in low temp C41 chems (I've just bought my first C41 kit from Silverprint and am raring to try all the odd development things I've theorised about over about the last year...) Anybody got any tips on that too?