Beachculture Qantas Domestic Terminal Melbourne is closing down and has 50% off storewide - no exceptions. Their stock includes a lot of summer 2010 stock, mens t-shirts and boardies, sunglasses, watches, jewellery and plenty of staples like Havaianas and Havaianas Kids. Havaianas come down to $15 at 50% off, $12 with the extra 20% off and they have other brands of thongs too.
I bought several items, and found out afterwards that if you sign up on their website as a VIP member, you get emailed a voucher for an additional 20% off. This is valid on sale items.
So, print the voucher before you get there and you get 50% off + 20% off !!!
A bit inconvinient since its based at the Airport but if you're travelling, definitely check it out!
ETA: Apparently there is 50% off storewide at Sydney and Brisbane International airport too - thanks lagunaz
pity airport parking is such a ripoff.