Click a book cover on my web site, then look for the "Click here to buy" link. That will send you to Amazon to buy that particular book.
Or use the links below to go to a list of my books on Amazon, IndieBound (which directs you to independent book stores in your area), and Barnes & Noble. Please note that these lists aren't always up to date. If you don't see the book you're looking for, type the title into the company's search box.