Despite sounding like the kind of shop you normally find at the side of an industrial estate in Fyshwick, the Lifestyle Store in Parramatta is having a car audio sale from 7pm to midnight, tonight only.
I've never purchased from them before, but I'm currently in the market for some 'high spec' (ie, non factory) car audio bits and a lot of the custom audio dudes purchase kit from this store. FWIW I like the look of the Boston Acoustics 5.5" splits for the front of the GTi.
Sale Flyer link.
PS - I have no affiliation whatsoever with this place, just thought some people might be looking for some audio gear before Christmas ...