For two days only (today and tomorrow - June 21-22), Amazon Australia has a heap of specials for paid Prime Members.

Link to the Transformers specials still available (currently about 50 items on there, up to about the 3rd page)... you have to be a paid Prime member and be logged in to have the discounts automatically applied at checkout (the full price will still be listed before you get to the checkout page, so be sure that you select an item that has a "Prime Day Deal" discount noted directly under the price listed in the main body of the product page)

It should only be for items sold by Amazon Australia, but there appears to be a couple of import items included (like the Botropolis pack), which don't have a percentage discount, but a set discount price.
Most Transformers items are 25% off.