thanks for the info but on 2 of the side missions, not the book, I should be able to buy the items at the Spector terminal in the Spector room where the shooting range is. But those items are not there unless there is another terminal I am not aware of.
Thanks,
Russ
Following sundance31us's link shows this text with regards to acquiring the Book:
Scan the volus homeworld of Irune in the Aru System of the Aethon Cluster to acquire the book. The Aethon Cluster will not appear on the galaxy map until after completing Priority: Tuchanka.
Return to the Presidium Commons in the Citadel after obtaining the item, and speak to the Angry Accountant. You will receive an update on the Citadel Defense Force War Assets.
There is one other location you can access the Spectre Terminal, but it has a 10% mark-up price, and that is on the Normandy, in the shuttle bay, in the Kiosk on the right. I use that to review what purchases are available, then go to the citadel to those appropriate stores to make actual purchases.
