My buddy got me to join for the referral bonus and also let me know about this code - BEEMME10, not sure what the limits are but it worked for me, enjoy!
This offer also combines with introductory referral bonuses.
Use the RANDOM link below to obtain a referral code. To enter your own referral code into the system, click EDIT.
See freakitude's comment with more instructions: https://www.ozbargain.com.au/node/426906#comment-6759673