I have filed a new FOIA request. It is for records of compensation payments made to the eleven people who sat on the 9/11 Commission and was submitted to the General Services Adminsitration, which I understand has some records related to admin work for the commission.
The compensation payments were basically salary by another name. As far as I can tell based on partial records Erik found at the National Archives, not all the commissioners were collecting them, and most of the ones who did got not very much. However, one of the commissioners had himself paid an amount probably not that far south of US$ 100,000, which is not chump change, and it would be interesting to know exactly how much he got.