https://extra.bet365.com.au/promotions/open-account-offer sign up via this link. Make sure you tick the box when about to deposit “claim $200 bonus credits”.
Once done, you will need to bet your $200 in order to claim the bonus (must wait for the game to be finished).
Bet the $200, then cover elsewhere. May have a small loss, but you will quality for that $200 bonus. Hope that helps.