OzGameShop currently have 10% off a selection of board games on their website. Given that they are already WELL below local pricing in store and online and also offer free shipping, I figure this is about as cheap as you're ever likely to see some of these games.
Just a few stand-outs that I'm picking up:
Small World: $39.59 after discount (~$58 + postage online locally)
Settlers of Catan: $35.09 after discount (~$46 + postage online locally)
Ticket to Ride: $42.29 after discount (~$58 + postage online locally)
Dixit: $27.89 after discount (~$40 + postage online locally)
Risk $30! Best price I've seen for it