20% off all Lego. Just be careful as some of the items are cheaper elsewhere after the discount.
Example of a deal would be the Lego cargo train 60052 for $240
http://www.yogee.com.au/legor-city-60052-cargo-train.html
If you're in Sydney you can pick up from the store, otherwise I did a test on shipping to my address on the Gold Coast and it was $18.
This isn't a good deal at all. As an avid Lego collector, the 20% is first and foremost standard for the Australian scene and sales happen every 2 weeks or so.
The prices on offer are also inflated to make it look like they're actually on sale. At a quick glance, almost all of the Star Wars sets are more expensive when compared to other sales.