I've mentioned the 4.76% that RaboDirect in a few other threads as this is higher than the best interest rate for 5 years term deposit, sadly the 4.76% only lasts for 4 months, however at the end of the 4 months you can ditch and switch and go with another provider, ING Direct and Rams are offering interest rates of 4.75% at the moment, so there's a few choices around these rates, see the most up to date instant access interest rates for savings here:

Best interest rate for instant access cash savings in Australia

Or go directly to RaboDirect's deal here:
High Interest Savings Account - up to 4.76% interest | HISA | RaboDirect