Not sure if there are many free jazz/improvised lovers on this board. But the Instant Composers Pool who have been releasing free jazz albums since the 60s have recently put out a CD box set of all their collected works over the last 50 years. I received mine last week and it is truly one of the best musical purchases I have made. Han Benink has said it will be very limited, and it looks like they are selling through the last of them now.
http://www.icporchestra.com/icpbox/
http://www.icporchestra.com/icpbox/