Target Sefton Park have Studio Series 38 Optimus and Rampage. Plenty of both, picked up an Optimus which is scanning at $50 as of Sunday. Mention that because I've heard some interstate have gotten them cheaper because they're not on the system and maybe one sale was stopped because of it. Anyway, probably depends on the store but it might be worth trying to price-match with the Myer voyager sale as I got mine for $40.

Also the Shatter/Scrapmetal wave is there, which is maybe news for that store if not anywhere else.

Siege is just wave 2, mainly voyagers and micromasters.