Attention shoppers! What's your take on Costco's new warehouses in Sydney and Canberra? I hear it's chaotic out there -- so let me (and other Giz readers) know if the tech bargains are worth the fuss. Likewise for Apple's new store in Penrith -- did you test drive the new MacBook Airs? Email or tweet @giz_au your pics/video, and comment within.