<p>I don’t know about Book Exchanges, but if you just want to buy your books used online, there’s this great website [url=<a href=“http://allbookstores.com%5Dhere%5B/url”>http://allbookstores.com]here[/url</a>], called AllBookstores, that compares the prices of used books from all different sites so you can find the cheapest ones.</p>