sucksqueezebangblow http://www.gumtree.com.au/s-ad/albany-creek/auto-body-parts/mazda-3-mps-whiteline-rear-swaybar/1119351758
AshDVS It'll definitely fit, make sure that you pick up a set of Mazda3 swaybar links too, as the holes in the bar are larger on Mazda models than they are on Ford/Volvo variants - you should be able to use the Ford/Volvo links but they'll wear prematurely. 27mm may be a little big with a stock front bar but it'd still be worth grabbing as you could always change the front bar to suit.
AshDVS Mazda 3 MPS is 25mm. These guys will have one - http://www.formaz.com.au/ It should come with links too.
AshDVS Mazda 6 and Mazda 3? They're not the same platform, though they may share some components, so its possible that the swaybar may be the same between them too but I don't know.
AshDVS Ah sorry, apologies. Mazda3 MPS should be the same pre and post facelift (the facelift came in around 2009). You should find the bar you need on a Mazda3 MPS between 07/2006 – 10/2013. From memory the bar I have has 2009 marked on it.