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?