The easiest way to order MathStart books in Australia is through an Australian educational book distributor. Your school likely has a list of preferred vendors. If the vendor doesn't stock MathStart books, ask them to order the titles from the HarperCollins Australia office. Contact [email protected].  If there are any issues, pleases contact [email protected]. 

Note that HC Australia will only sell to book distributors, not to individuals.

MathStart titles are also available through Booktopia