I was just looking at my incoming searches, and saw ‘resin jewellery supplies Brisbane’. Well, I’m in Brisbane, and I use resin… but I haven’t yet found a supplier here! I actually order my resin (the nasty stinky stuff… but so much cheaper than epoxy!) from a company called Adelaide Moulding and Casting Supplies.
For those non-Aussies out there, Adelaide is another capital city – a very long way away! However, I would definitely recommend them, and I will be ordering from them unless I find someone closer. The postage is a bit steep, but the price of the resin is 1/2 what you would pay from a ‘craft’ supply store online.
So if you’re in Oz and want resin, give them a looksee 
Here is the exact link to one of their resin products.
