I found this looking at the canstar website, and it is currently the highest interest rate available. It is meant for people who are getting married.
You will need to join the credit union for a share cost of $2, but it seems like the account is free.
http://www.matrimoney.com.au/how-does-it-work
http://www.matrimoney.com.au/for-couples#HowdoIapply?
http://www.matrimoney.com.au/why-choose-matrimoney
Hopefully some people here find this useful!
Interesting! Wheres the catch……?