Previously this service was only in ACT, NSW & QLD but now available in Perth:
https://www.ozbargain.com.au/node/709592
Essentially rather than having to take your bottles to a collection point to get your $0.10/item refund they will collect from your place (with a minimum of around 100 items).
They normally charge $0.03/item for this service (so you get $0.07/item) but they have just launched in Perth & have no fee on your first collection using the coupon code.
Excellent