<p>Reminder: you can find new and unused copies of AP review books, all subjects at practically no cost. My kids saved a ton of money buying their various prep books on Amazon. New and unused books for all subjects (and ACT and SAT prep) can be found really, really cheap - even with shipping costs included. Also remember that a prep book doesn't have to be the latest edition for your study purposes. We didn't realize this with our oldest and paid full price; with our youngest, we bought used (but unmarked, in most cases) - saved a lot of money and worked just as well.</p>
<p>Also reminder: don’t forget about your library! There are often many of the latest editions of prep books there, and for free, too.</p>