You can get 25% off Gamesmen stock on eBay* if you pay with Afterpay and use the coupon AFTOYS25, or 20% off with other payment methods using TOYS20.
Of note they have Legacy wave 3 pre-orders that come out slightly cheaper than Amazon, and imo the best thing here is SG Soundwave for a price one could say a voyager and a set of Micromasters are worth, $88
https://www.ebay.com.au/itm/334615171715

*coupon works on other stores but could not find anywhere else with Transformers in it

in my experience the coupon displays underneath the price of eligible items, but if you cannot see it here is the T&C page