Earlier volumes available in the commission lists, joint projects section, or the torrent.
Here’s the newest SaHa batch torrent of translated manga and doujin as of March 2013. If you’ve been seeding the July 2012 torrent, this should recognize all the old files and replace any files that have been updated.
March 2013 UPDATES ONLY (ie: Only contains what has been released since January 2012. Approximately 4 gigs.)
Full March 2013 Batch (ie: This is all 44ish gigs.)