Please forgive me if you already knew about this ...
I found a site in Australia that sells four-piece Lock & Lock lunch sets like the one I used for , but not the same colors.
I have no idea where they'll ship to, I just sort of stumbled upon the site. I have no affiliation with them whatsoever, have never tried shopping there, all that disclaimer stuff.
But there you go, Ozzies, have at it!