This is a collection of covers of various Armed Service Editions published by the Council on Books in Wartime for the World War II soldier. A simple Google search will yield many more. Collecting the ASE is a lot of fun. Certain titles like Bram Stoker's Dracula (ASE #851, $100) are very collectible, but you can buy many of them for 5-10 dollars depending upon the condition of the books (poorer conditioned books are cheaper). Here's a link to recent Ebay sales of ASE's. I'd recommend your local used bookstore first though. Online prices are usually higher than in-store prices from a brick-and-mortar store.
Armed Service Edition Cover Gallery