Big W currently has 20% off "big brand" toys which includes Transformers. This stacks with the 10% off storewide ozbargain coupon (at link).
Saturday 17 Nov to Sunday 18 Nov.
10% off storewide
e.g. SS Deluxe = $29 * 0.8 * 0.9 = $20.88
https://i.imgur.com/ao9GSLNl.jpg