I've been purchasing used books on history, politics and science from Amazon for almost the cost of shipping, which is close to or less than the cost of the fuel it would have taken for the two round trips to the library, and it takes a lot less of my time. Funny thing is, about half of these have library card sleeves. These books sat unread in libraries (you know, the places that supposedly have "content you want to read") for decades almost untouched (based on the condition I find them and the empty cards I find in said sleeves) until the libraries sell them off to make room for more new books almost no one will read. Here are a few from 2013;
(shipping included with these prices.)
Nuclear disaster in the Urals, Zhores A Medvedev, $6.98
The Forsaken: An American Tragedy in Stalin's Russia, hardcover, Tim Tzouliadis, $6.78
Red Atom: Russia's Nuclear Power Program from Stalin to Today, Paul Josephson, $4.94
The Future and Its Enemies: The Growing Conflict Over Creativity, Enterprise, and Progress, Virginia Postrel, $4.00
Behind the Facade of Stalin's Command Economy: Evidence from the Soviet State and Party Archives, Paul R. Gregory, $5.36
The Legacy of Chernobyl, Zhores A Medvedev, $4.49. (got 2x for some reason; gave one to a co-worker.)
I could go on all day as I've been reading this sort of stuff from Amazon for going on ten years now. Most of these are hard covers in excellent condition.
The truth is libraries are dead to me as a source of reading material. I can't afford the time or fuel it takes to frequent them, and they simply can't host the selection I demand, which is why they purge themselves of their stock using Amazon. Right or wrong that's how it is.