Having worked at a company that made both Kindle and printed books, here's something to think about- if someone can make a Kindle book for $9.99 (and this seems low, even for a book, let alone a text book), they can make a printed book for $19.99.<p>The problem isn't that books are printed on paper- paper is cheap.<p>If teachers contributed to and utilized wikibooks.org (or similar services), we could have free textbooks (or, low cost, if you choose to buy/print them- and, there are services that will let you print wikimedia wikis).