Wander down to Hawker Pacific mate... they've got a pilot shop down there, which I am pretty sure is an agency for downunderpilotshop, as they all have the flyers and stuff there.
The prices are not tooooo bad (only have to give up one of your kidneys)... and they carry lots of DC stuff... pretty sure I saw mic muffs in the glass display cabinet when I was there the other day to grab a new pillow top headpad thingy...
They also stock maps/charts cheaper than the "pirate" supplies in the pink building
