WORXWINTER20
Worx has 20% off store-wide on eBay.
I've been wanting a robot lawnmower for a while and it seems Worx is one of the better reviewed and has a decent reddit community.
They also have the 1000m²: https://www.ebay.com.au/itm/383079441524
and 1500m² models on sale too: https://www.ebay.com.au/itm/383079525899