Hi Lara
we have never used the mag taurate as my son has been on the calcium/magnesium/zinc with separate taurine for years (in mg of each 1000/500/50 plus 500 each evening)
I do know that when we stop giving the taurine, he feels the difference with more frequent tics.
As MrsD said.......here taurine is relatively inexpensive and readily available
http://www.iherb.com may have reasonable shipping rates to Australia as they seem reasonable on all other things too...dont know if you are allowed to ship it into the country tho