Aldi had these on special for $39.99 back in early December, see this link:
http://www.ozbargain.com.au/node/59473
Anyway, I nipped into my local Aldi earlier this afternoon (Toombul) to stock up on some coffee capsules and they're obviously trying to clean house to shift the last of them…. still had a few left when I was there.
I don't know if it's nationwide and obviously depends on the stock levels of the individual store but if you've noticed them sitting there over the last few weeks then you might be lucky :)
Un-Advertised clearance prices are generally store by store.