EB has got a trade deal atm, where you can trade in 3 PS5/Xbox Series X/Switch games and you can pick 2 Nintendo Switch games for free (from the Mario day selection - refer to the deal link)
You can refer to the deal below for the games that qualify from JB's 2 for $30. I know Farcry 6 and Metro Exodus do qualify for trade in.
https://www.ozbargain.com.au/node/896514
Overall I got 2 Nintendo Switch games for $49 (I traded in 2 copies of Farcry 6 PS5 - $30 and 1 Suicide Squad PS5 - $19)
Also, note that the store won't allow you to trade in 3 copies of the same game.
Trade-in games that are confirmed by other users:
Way of the Hunter XSX - JB
Skull and Bones XSX - JB
Suicide Squad PS5 - JB
Tiny Tina's Wonderlands PS5 - Big W
Minecraft XSX - Big W
FC 24 XSX - Target
Payday 3 XSX & PS5 - JB
Prince of Persia XSX - JB
Crash Team Rumble XSX - Target
Destroy All humans PS5
Wild card football PS5
Skulls and Bones PS5 JB
Tchia PS5 JB
Exoprimal PS5 JB
Spellforce 3 Reforced XSX JB
Monster Energy Supercross 5 XSX and PS5 JB
Scars Above XSX JB
Ghostwire Tokyo PS5 CEX
Assassin's Creed Mirage PS5 CEX
Updated - credit @Jollystacker
Thanks @MetallicDodo, @Jameslane and @Ellimist22
maximum lifetime/long time 2x of the same game >.>