BookFinder.com has recently published its fifth annual list of the most sought after out-of-print tiles. A Civil War book comes in at #4 in the top ten list for history books. It's The Civil War in Pictures, edited by Fletcher Pratt.
It's extremely easy to find if you're just looking for a reading (or viewing) copy. ABE alone lists 316 copies for sale ranging price from $1 to $99.95 for a way-over-the-top hardcover. The first edition was published by Henry Holt in 1955 but became a huge bestseller with a featured presentation by the Book-of-the-Month Club two years later. A first edition in dust jacket will go for around $20 with one in premium condition upping the ante somewhat.