I have 2 nominations that could be barely noticed by many people.
The first one is Virgin Australia’s A330-200.
And another one is Tianjin Airlines A330-300 (not -200 in the game, and I didn’t see anyone has posted that)
I was onboard that aircraft type in earlier years on an inauguration flight (wasn’t aware of that until I was at the gate). And I got the ticket between Australia and China for like $AU 200, or around $US 135. It was even cheaper than a domestic Qantas flight in Australia, even at that time when Qantas was still some distance away from a total joke.