Decathlon up to 50% off Selected Bikes. Riverside 500 Trekking Hybrid $199. Rockrider ST 520 MTB $299, Triban 500 Road Bike $399
Decathlon is currently having a "up to 50% off selected bikes" sale until 29 September, and there appears to be some good deals.
Not all sizes are available though. Shipping can be expensive ($58 to ship a MTB to Sydney suburb), but Click & Collect is free.