«Since 2011, the Proceedings of IISL Colloquia are published annually by Eleven International Publishing, under contract with the Institute. An IISL members’ 40% discount is available for proceedings bought from Eleven.
Now you can «purchase the bound proceedings for the Colloquia on the Law of Outer Space from 1992 to 2010», and «view a list of proceedings available from AIAA. All IISL members may purchase these proceedings at the AIAA member price.»»
More info: here.