It appears as if the price of Blu Rays has dropped by 20% tonight on the JB Hi-Fi website. There are quite a few titles on special around the $10 mark and new releases have dropped in price too.
It doesn't appear that deals combine. Still it might be worth checking out this earlier Buy 1 Get 1 Free deal too which is now available online:
http://www.ozbargain.com.au/node/69369
Direct link to B1G1F titles:
https://www.jbhifionline.com.au/dvd/bd-buy-1-get-1-free.htm
Hopefully tomorrow someone can confirm whether this is also on instore.
UPDATE: Also includes DVD, ends Sunday.
I heard instore today they are doing it instore from tomorrow.