I only found out about this over the weekend, and was able to check a store yesterday... and then found it on their website today.

Aldi has Special Buys each week, starting on Wednesdays, and on June 14th (two weeks ago), they had a new batch of Transformers Authentics Titan Changers, including this year's wave that had Soundwave (with wave 1 Optimus & Bumblebee). They are $30 each.
https://www.aldi.com.au/en/special-b...an-changers-1/

Looking at the Stock Check tab, I found that a lot of stores still had stock, but there is no guarantee which figures would still be available.

A couple of years ago they had the first two waves, which was Bumblebee, Optimus, Megatron, Starscream and Grimlock... but it looks like we missed wave 3 (2021) Optimus Primal and wave 4 (2022) Cheetor... but it looks like that Cheetor might have been cancelled and released in ROTB packaging this year instead.