If you use a Canadian reshipper you can still buy them from Amazon CA for around $90 plus reshipping fees.
https://www.amazon.ca/gp/product/B08...1-a65b129fdd73
I have a list of all G1 characters that have been released in CHUG form. You can find it here. Please feel free to let me know if I got anything wrong so I can fix it.
I saw the conehead 2 pack is popping up on ebay through the usually hong kong sellers, so I don't think this pack is going to be as hard to find as the seeker 2 pack. It doesn't appear to be as exclusive.
I was really hoping that Amazon Australia would have listed the US stock by now for the 2 2-packs (like they did for the Dead Optimus), but I'm fearing that they aren't going to be listed after this much time now.