Just the other day I was at my local Barnes and Noble bookstore, and found some copies of Gustavson, Todd 2011 500 Cameras: 150 Years of Photographic Innovation. New York: Fall River Press. [from George Eastman House]For sale in the discounted books section. It's a lovely book, as good in its own way as Gustavson's other recent historical work Camera, which has been mentioned previously on Photo.net And it's for sale at remainder prices, for whatever reason. It's listed on the B&N website, but at a slightly higher price, I think, than I paid in store. Also at other on-line vendors, again, for a slightly higher price.