Under 21s signup: https://www.westpac.com.au/personal-banking/bank-accounts/tr…
Newly arrived people signup: https://www.westpac.com.au/personal-banking/bank-accounts/mo…
International student signup: https://www.westpac.com.au/personal-banking/bank-accounts/tr…

$0 monthly service fee for these select groups.

Local tertiary students, international students, and newly arrived people must verify their identity (or student status) at a branch to enable withdrawals and attain $0 account service fees.

T&Cs:

*$50 Offer: Fees and charges apply. Read the terms and conditions before making a decision and consider whether the product is appropriate for you. Excludes customers who have held a Choice account with Westpac anytime from 5/2/17. You must be under 21 or a full time student or new to Australia (i.e., arrived in the last 12 months). Eligible customers need to open a Choice account online between 5/2/18 and 29/3/18 (inclusive) and deposit a minimum of $250 within 45 days of account opening. Eligible customers who have completed identification will receive $50 deposited into their account within 55 days of account opening. Offer limited to one $50 deposit per eligible customer. Where a joint account is opened, the offer is limited to only one $50 deposit in respect of the account. If one of the joint account holders has already received their $50 deposit in respect of another account, then none of the remaining joint account holders will be eligible for the offer in respect of the joint account.

TL;DR

Be under 21, or a full-time student, or new to Australia (<12 mo)
Excludes customers who have held a Choice account with Westpac anytime from 5/2/17
Open a Choice account online between 5/2/18 and 29/3/18 (inclusive)
Deposit minimum $250 within 45 days of account opening

PROFIT

Free ISIC card (save $30) also still available:

^New Westpac Choice customers only. Offer available for full-time students, or customers aged 31 years and under. This offer is valid for 90 days from the date your new Westpac Choice account is opened and you are required to have your ID verified before claiming this offer. This offer only provides you the first year ISIC membership valued at $30. The STA Travel voucher is valid for 12 months from the date of issue and can be used at any local STA Travel store and not online.