Big W has G1 styled Optimus Prime and Megatron Cupa Chup holders on sale for about $5.50 a piece.

They have little poles in their backs that enable each hand to punch out, and if you hit the faction symbol on their waist then their head pops up, all Rock-em Sock-em robots style.

They cant actually punch each others symbols though, but they are pretty good fun and look alright.