Navan's February Valentine's Promo is live. Get USD 30 credit off your next personal travel booking. Previous deals were targeted toward business travellers.
AUD conversion was done on 4 February.
Once you have signed up for an account (You need an ABN), you should see a button in the "Promotions and offers section).
T&Cs available via app so I cannot provide direct link. Screenshots 1 here2 here 3 here