Damn. I am such a sucker for Arnott's Tim Tam. This week they are on special at Coles for $1.35 (save $1.39) — by far the cheapest I have seen this year. They are on Coles' catalogue this week which you might find one in your mailbox. Linked is the Coles online page also showing the same price.
Lol now its really a "sweet" deal :p