I bought this 10 days ago from Computer Alliance for $2399 as a work computer. It has the latest gen Ryzen 9 chip (4900H) and runs my excel spreadsheets amazingly well. Apparently also good for gaming but I wouldn't know as my company won't let me install Steam. The Ryzen 9 chip competes with the Intel 10th gen i9 chips, and generally far better than the i7 chips.
It was very hard to find a laptop in stock with this chip so I doubt there will alot of stock available. I had a look on staticice and the next best advertised price is $2299 at Umart, Scorptech and PCCG but all are sold out anyway (https://www.staticice.com.au/cgi-bin/search.cgi?q=asus+tuf+r...).
I don't know when the code will expire. Still works as of 9:41am on 2 July 2020.
Edit: Free pickup, $10 delivery to Brisbane, delivery to Sydney/Melb/Perth/Coffs Harbour was $15 but check your own location on the site.