Hi Guys,
Canberra is turning 104 on the 13th of March, so to celebrate the National Gallery of Australia (NGA) is currently offering 2 for 1 tickets to the "Versailles: Treasures from the Palace" exhibition.
Tickets can be purchased via Ticketek using the code 'NGATREASURES'.
I think this offer is probably valid until the 13th seeing as that is Canberra day, but it may last longer. You are able to purchase tickets to other dates using the code. So if you're planning on going and don't have tickets yet, it's pretty much 50% off per person.
http://nga.gov.au/Versailles/Default.cfm
Seems it's only valid for dates until the 24th of March now
Car Park is Free on weekends too AFAIK.