Not all Game Stops carry them sadly.
This is kinda what I'm getting at. There doesn't seem to be any consistency. The most frustrating part being that even the US MegaBrands Shop itself says "Not available" for sets that are actually available, and that this was the case for the 2017 Armory sets (FWC, Dead Orbit, Shaxx and Xur). On the other hand, it has links to Amazon and Target for the Heavy Pike set!
Thanks for the tips on the "Heroes" minifigs. I'd already seen them on Amazon and I've got 3/6 of them ordered. Haven't found any vendors that ship the other 3 direct down under yet. Soon as I do, they'll be mine!
Unfortunately, the 2 sets from EB games are horrendously overpriced. Their price for the Harvester is about as much as a PS4. Thankfully I managed to get mine from Amazon US during the Black Friday sales for less than half EB's price and that included the international shipping to Australia.
I also managed to convince a colleague from one of my company's US offices to walk into a GameStop and pick me up their exclusive RavenSteel Sparrow to bring over when he next comes. I might have to ask him to also go to Target for the Heavy Pike for me. I'm also expecting the Aspect of Glass and Goliath Tank to arrive next week too.
I'm going to have to buy another glass display cabinet for them all to go in, as well as find a display case big enough for the Cabal Harvester. It's starting to collect dust sitting on top of my current cabinet.