Of this set specifically? I won't be organising further group buys of this. Of course, that doesn't mean someone else won't if there's enough interest and you are all prepared to pay the now very high prices.
However, I will organise the next series as part of my normal group buys when it is released in a year or so. You can get in to any group buy simply by responding to the specific series group buy thread when I create it. I keep a post at http://www.ozcardtrader.com.au/community/threads/group-buys-2012.112196/ that I update with links to the various group buy threads.
There are currently group buy threads for Game of Thrones, Fringe and NCIS.