I just got my first quote back and they have suggested a reship service.. Which I don't plan on using because of cost.
They also have concern about shipping to Australia, but the only issue will be the timber will likely need irradiation (this may damage the cartridges).
I have gone back and asked for a quote regardless.
It may be worth investigating adapting the cartridges for local woodware? Even if we order the cart refill kits and sets of springs then get follower boards cut locally.
It's unfortunate they don't pack down flat, would make the shipping much more agreeable.
Last resort.. We order to @cowgirl 's place and then forward ship from there
-edit- The closest Australian sized box is a 'half' which you may be able to find a supplier for (pretty sure Burnett supply half sized supers). A half depth box is 124mm (4 7/8), Hogg super 120mm (4 3/4).
Not sure how keen Flow are with us organising commercial group buy for another product on their forum.. If there are any issues, happy to move the discussion