Woolworths don't have much with Transformers at the moment... and not all stores will have each product range. Most have the small Authentics, and some have the Tiny Changers (series 2 has shown up there now), while some stores may still have some of the large Authentics from earlier this year during one of their promo toy sales (a pre-pack cardboard display).
The toys I found were noted as having 10% off until July 2nd.