Of course all the regular ways of getting by cheap apply, but since I'm still here I'll write down some specific tips. Also if anybody has some tips I'll update this.
Accommodation:
If you have a tent, try asking at some of the hostels, their tent sites are cheaper than the ones of the holiday parks and you probably don't have to pay extra for using pans or pots. The bumbles as an example has a tent site for 20$.
If you don't then there is a motel offering backpacker accommodation starting at 22$ which isn't member of either BBH or YHA and with that price it's cheaper than most bbh as well. It can be found close to the aforementioned hostel.
Supermarkets:
There is a "fresh choice" in gorge road which is a little cheaper than the centric "alpine supermarket"(which is a four square actually). If you have a bike or car you can also go to the new world supermarket in Frankton.
There is a "fresh choice" in gorge road which is a little cheaper than the centric "alpine supermarket"(which is a four square actually). If you have a bike or car you can also go to the new world supermarket in Frankton.
That's it, not much, but hopefully that will help someone a little.
