Just received an email from TRU Australia, looks like they may not be stocking this set:

"hi, I was wondering whether you will be obtaining any stock of the Transformers: Generations Chaos on Velocitron 5 Pack Action Figure Set and if so when you expect to receive stock and the expected price. Thanks."

"Thank you for your inquiry.

Unfortunately it does not look like we will be stocking this item, there doesn't seem to be any information in our system to suggest that we will be stocking this."

Could be too early but I tend to think we just won't have any luck here. Time to try source from overseas before I get slugged GST on the purchase...