Check out Extreme SAS (Sport and Survival) on Facebook. I can't find it on their website but Dean sells a lot of gear via his FB page, does a lot of specials and bulk packages on there.
Dean is based in QLD which makes purchases a lot easier. Just make sure you know what you are not permitted to own in each state before making a purchase.
That was 1 thing I noticed at last years SSAA Shot Show here in Perth that a lot of the sellers were selling and supplying products not allowed under WA's weapons act.