Hi there, and welcome to the forum!
There are two CDs that I know about from The Great Society. Both of which are a must have.
First, Live at the Matrix, which I think is the Collector's Item you referred to, which was released with the names Conspicuous Only in its Absence
and How It Was
. Both are included in this CD:
http://www.cduniverse.com/productinfo.a ... 5353&BAB=M
The other CD available is Born to Be Burned
, which includes the singles Free Advice and Someone To Love, in addition to 15 previously unissued tracks:
http://www.cduniverse.com/productinfo.a ... 3237&BAB=M
These are the only available releases from The Great Society. But there is a song called Bulldog Blues played at The Matrix, but was not released on the album. Thanks to Craig Fenton, it is on YouTube.