TPG is the classic Australian headline-pricing case. The ad did contain more information, but the headline did the commercial work. The High Court's point was that customers read advertising as a whole, and a business cannot rely on fine print to repair a dominant misleading impression.
For small businesses, this matters any time pricing is bundled: subscriptions, memberships, delivery fees, setup fees, minimum spends, add-ons and required companion products. If the customer has to pay it, the headline needs to make the real price obvious.