Hi Christopher,
I've found Col Taylor and Monaro Models very helpfull with most kits. If they don't have it in stock they will source it for you.
http://www.coltaylormodels.com/shop/index.jsp
http://www.monaromodels.com.au
With such a small population it is often necessary to order from afar to source what you want here in Oz. More power to you in wishing to build a kit you will learn far more than assembling an ARF. Please learn to fly first, before putting your newly built pride and joy into the air!!!!!! A SIG Pig (hog) is probably a second or third model after you are proficient with a trainer or similar beginners model. Don't let that stop you from building what you choose whilst learning to fly.
Cheers,
Colin