This seems one of the better Qantas points offers at the moment. Couldn't see it had been posted.
$139 + $75 annual fees for existing members (you can sign up for a free account easily online).
Sell the two lounge passes and you're looking at around 0.18cents/pt.
Plenty of t and c's to check. Pasta below from the site.
Amplify Qantas Signature offer
80K Bonus Qantas PointsWhen you spend $6k+ on eligible purchases in the first 90 days from new card approval.
Already with St.George? Sign in and apply to get a $139 card fee for the first year (reverts to $295).
Offer not available if you've held a St.George, Bank of Melbourne or BankSA rewards card in the last 24 months. New cards only. T&Cs Apply.
Exclusion period also 2 yrs if you had the card previously?