Now that you've decided which book you want to read...or are at least willing to read for the sake of the course, it's time to gain access to the book. I say "gain access" because there is no mandate for everyone to purchase the books--if you are able to borrow one from a friend or a library, by all means do so. We also encourage the buddy system if you know someone else taking the course and want to share a book.
The books can all be purchased online, either at Amazon from the list to the right, or from a number of other online resellers such as Borders, Barnes & Noble, eBay, etc. If you happen to be at an actual bricks and mortar bookstore, you should find most of these books in the Business or Marketing areas of the store rather than in the Education section, though you might want to call ahead before making a special trip, to make sure they are in stock.
The reading assignments don't begin until Unit 4, so you should have a couple of weeks to ensure delivery of your book from wherever you decide to get it. If you have any trouble finding a copy, please contact your course facilitator.