The tickets have become available from the Welsh Rugby Union following their crackdown on the unofficial sale of tickets through various channels.
"We've conducted a number of operations around the games this month and uncovered a lot of helpful facts and data on where tickets go once they are bought by clubs and debenture holders. Due to this we have decided not to release tickets to certain third parties and organisations," said Millennium Stadium chief executive Paul Sergeant.
"The few hundred tickets we have left for the last game have now been put on sale and we hope these will find their way into the hands of genuine fans. The response from the Welsh public to this series has been incredible and the game against the Wallabies will be another sell-out."
The tickets (all at £45) will be available for purchase this week until stocks run out. The Ticket Office is open from 9.00am-6.00pm on Tuesday, 9.00am-8.00pm on Wednesday and Thursday and until 5.00pm on Friday..
Also on sale at present are tickets to the third International Supercross event at the Millennium Stadium on Saturday, 3 December. Tickets for this high-octane event are £18 and £25 for adults and £10 and £13 for juniors.