This is the cheapest new GPU that will actually play games I have seen. It's the GDDR5 version, low profile, and passively cooled/silent.
It's cheaper delivered on eBay than their website, but is cheaper to pickup in person in NSW only: https://www.jw.com.au/store-locations
Item link if ordering for pickup: https://www.jw.com.au/inno3d-geforce-gt-1030-2gb-gddr5-dvi-h...
Item link if ordering from eBay for delivery: https://www.ebay.com.au/itm/224610227683