I had a look at their site, and it's weird that their SG amount (SG$190 + SG$16 shipping) converts to au$220 at the current exchange rate... but when you use their site to convert their prices to AU$, it only comes to AU$210. Obviously best to pay by AU$ on that site. (either way it is a lot cheaper, even compared to Japanese listings)
It is indeed puzzling why this one is so much more expensive on Zing/EB, but maybe the question is why OMP is selling it so cheaply, as the JP retail price converts to about AU$300, so if you were buying this in Japan, it would be the same price. (fortunately some online stores like HLJ have a 20% discount for pre-ordering it, so it comes down to AU$240 plus shipping... which would still just be a little cheaper than the Zing/EB price).
I guess with MPM Megatron being about AU$100 cheaper than it was supposed to be, and this one being more expensive than some Asian options, it's just a matter of win-some-lose-some... or EB Games didn't think that they would sell many of Lio Convoy, so need to make more per unit.