Amazon just keeps on giving
Got this email on a account i created 1 month ago with a frew prime trial (still active trial) even though it says paid membership only .. go figure
$15 off first eligible purchase applies to Australian Prime members (paid memberships only – excludes Prime members on free trial) who have not previously made a shopping purchase on amazon.com.au or the amazon app in previous 12 months ("Eligible Prime Members"). These Eligible Prime Members can receive $15 off their purchase of $39 or more of eligible item(s) when they redeem the promotional code 'PRIME15' at checkout via the Amazon app or amazon.com.au ("offer"). T&C's apply.
Enjoy
Might make you ineligible for cashback