I'd DEFINTELY fly considering there is very little difference on price, and think about the convenience and ease for you and your kiddies.
Not to mention the fact, that like you say, something COULD happen to the car, and you just don't have the money for it, it's better not to take the risk of you really cant afford it.
Like others have said, perhaps sell most/all of the furntiure too? It'd save you tonnes on moving costs, and you can buy new (2nd hand) stuff in melby on Gumtree or FB garage sale sites.

Perhaps to save more money, sell the car, then it's even cheaper to fly over (dont have to transport the car) and buy one over there? Depending where you live in melb, you may not need transport *as* much, so can survive a few days without it.

*hug* good luck hun, whatever you choose


Sent from the land of "iSomethings" so forgive me for any spelking misstaks