I'm not sure of how much the licencing is, I'm in Vic.
Off the top of my head, roughly the cheapest you could get away with setting up an enclosure for it (at least a starter anyway):
Housing:
2foot fish tank: brand new $40; second hand probably about $15-20. Alternatively a large tub: $8-$40 depending on size and quality. In my opinion you're better off getting a fish tank, it might be a little more expensive, but is more durable and more visually appealing than a plastic tub.
Heating:
Pre-wired light fitting for heat light: I've seen them around for between $20-$40, or if you don't mind it looking really ugly get a lamp from bunnings, about $10-12 and just suspend it at the height you need to get the right temps. I also use the philips spot lights ($5.50 for a two pack). Alternatively, a heat cord (around $20-$25, I get them from herp shop) and tile (less than $1 from bunnings depending on size) will do the trick for heating, and last a lot longer than $25 worth of globes, so does work out cheaper!
If you've thoroughly checked out your setup in terms of potential heat output of your heat source, you may not need a thermostat, I'm currently running 3 of ours using only timers, they get ambient temps at night. Either way, you will need a timer, which go for about $10 for a two pack at bunnings.
Lighting:
2 foot flouro fitting: honestly have no idea. I imagine you'd be able to pick up a reasonably priced "plug and play" type kit from bunnings. I would imagine that the uv tube itself would be the most expensive thing about the setup. From memory, I think 2 foot tubes go for around $30-$40? I have heard that you can use the black light uv tubes from bunnings, but replace them more often, but I don't know how much truth is in that.
Substrate: Coco peat bricks from bunnings. Less than $3 a brick and one would cover a 2 foot fish tank nicely, with plenty to spare.
Hides: Cheap but ugly. Ice cream containers with holes cut out, or other similar type things. usually free
still ugly, but free. Branches etc. Also free if you want them to be.
Water bowl: better off getting a cheap ceramic jobby from a $2 shop, they won't be able to tip it over like they would a plastic container. about $2
As an alternative to buying everything individually, if you find a secondhand fish tank setup, they are usually very cheap, and though it will be set up for fish, you'll probably pick up a tank with a light included, so it would work out more cost effective, even if you just throw out the stuff you don't need. You'll still need to buy a uv tube though.
If you don't have any other critters, you shouldn't need a lid for it. If you do have other critters to keep out of the tank, you could buy a lid (more expensive) or make a lid (more ugly.) Couldn't give you prices for that though.
I think that's everything, if I forgot anything, I'm sure someone else will mention it
Good luck with your potential new blue tongue!