Two for one ticket voucher code as found in the Canberra Times. There's a Ticketek booking fee in addition to the entry, but this brings it down to ~$15pp.
I'll leave the art critics to discuss the highlights in the comments. Probably not family friendly event.
Really good exhibition, I went the other day. There were plenty of families and young children there, just understand there's going to be some nudity and confronting artworks.