Not the cheapest, but has been a while since the last deal.
This is part of the Amazon mid-year sale.
Price is 20% off ($159 from $199 original price), plus combine with your favourite cashback for extra savings!
JB Hi-Fi has those speakers at same price if you prefer a physical store (although no cashback as far as I know)
Here is the JB Hi-Fi deal: https://www.jbhifi.com.au/pc-speakers/logitech-g560-lightsyn…
Bought these a while back through Harvey Norman (price matching JB). They are great! Haven't been able to use them to their full potential as they're quite punchy and loud, while I game mostly later at night when the kids are asleep.
All of my peripherals are Logitech and I'm using the Logitech G Hub software to control them, all of the settings are available within the one control panel and RGB lighting in synced across all of them (generally off).