Ok, I couldn't find these in any stockists, but I found some online (from NSW and QLD):
Both the ones in Aust charge for shipping so I made order to Melbourne and try some out:

- Ottogi 3 Min Meals.jpg (107.55 KiB) Viewed 29651 times
The first one I tried was a curry (hot), it is really just mainly sauce. There were 8 small cubes of potato and 2 very tiny meat bits but the sauce was nice and spicy. I had it with two bread rolls, but I guess you could do this with a bit of rice and some dehy veg and mushroom.

- Ottogi Curry Hot.jpg (62.3 KiB) Viewed 29651 times
I also tried a beef curry, and that had more ingredients in it, but only tiny bits of meat. Not sure if these would be handy for walking as a self contained meal though.

- Ottogi Beef Curry.jpg (54.65 KiB) Viewed 29651 times
I gave the black bean sauce (jjajang) one a go as well, and it is mainly sauce again, so like the first curry not so nice by itself. Didn't take a pic, but there was not much to see. Mainly a black sauce.
The meatballs were nice, and I could see it going well in a pita bread loaf. I'm assuming the same for the "hamburg" which I have not tried yet.

- Ottogi Meatballs.jpg (55.47 KiB) Viewed 29651 times
The bowl in the pic has a diameter of 19cm for reference.
I'll try out the other chicken and pork ones soon. I did also pick up a "hash" version which looks like the curry/black bean versions, but with veg instead of meats. I've yet to try that one out.
Things I found:
- It is a bit big for my solo pot, but folding the top over it fits in about 400-500ml water. And I can use the hot water for a cuppa after.
- The hole in the top corner is handy for a stick or chopstick to retrieve the sachet from a hot pot.
- I found three minutes in boiling hot water wasn't quite enough for my liking as a hot meal though. It was just a bit luke warm. But they can be eaten cold as well, so I think I might get some more of these meat type ones rather than the sauce ones as a lunch meal.