I have purchased large arcade items from the USA before, and they could quote all the relevant costs within $10. If they can do it, JJP can do it.
No one on earth gets items sent and then starts to work out the costs, it simply does not happen this way.
JJP just has to use the services of a switched on freight forwarder. If I was shipping many many hundreds of pinball machines overseas to various markets, I would be using the services of a decent freight forwarder, and with this onboard, all peoples questions can be answered.

If JJP try n send WOZ machines overseas, without all the relevant paperwork n assosciated costs being finalised before shipping, this will all turn into a complete disaster, cause anyone who has shipped large items from the USA knows, that all the relevant paperwork must be done, prior to sending, not afterwards, or the costs start tripling etc, and getting your item without paperwork is near impossible.

Without a freight forwarder at JJP's end, the freight of the pinball machines will be a nightmare. AND it should be at JJPs end, because they will have the buying/purchasing power with the freight forwarder. IF it is left to the individual at the Australian end, you will be at the mercy of the Aussie freight forwarders with only 1 item, and they will stick it to you $$ bigtime.