My Logitech speakers broke out of warranty so I looked around for a replacement. Did a bit of digging and found the Swan (also known as HiVi) M50W speakers on sale for 230 USD. Shipping to US is $31.50 but for some reason, shipping to Australia is free! You'd just need a travel adapter for the Subwoofer.
If another 6 sells then everyone gets it for 200 USD (266 AUD).
Distinctive features of these speakers are that it has a wooden finish and an aluminium control dial with LEDs.
I don't think it has been cheaper than this but I'm happy to be proven wrong.
Edit: Just dug a bit deeper into the massdrop comments and based on a comment apparently they 'hide' the cost of shipping.
For sure the cheapest, but the free shipping seems too good to be true. The box weighs about 16kg.