I was browsing Koala and Lazybed today, and the discount is shown on the Lazybed home page at the top.
The price before discount for Double is $850, Queen is $950 and King is $1050. Free delivery.
No idea how good they are; perhaps someone can tell me?
These brands pretty much always have these "sales", so I'm not sure if it could really be considered a bargain. It is a good amount off though.
The boxed mattress industry has exploded recently and it can be hard to navigate all the information. We went with Ergoflex because they've been around much longer than all these recent popups, and standing the test of time is a better test of a mattress than how it initially feels. They are also more open about the technical details of the materials in the mattress. It hasn't arrived yet though so I have no personal opinion.
For more information and discussion on all these brands, try http://forums.whirlpool.net.au/archive/2473017 and https://www.ozbargain.com.au/node/246989