Amazon offers a free 3-month trial of Amazon Prime for all accounts, including those who participated in a similar trial offer in the past, via these direction:
click the link in this post and add the book to cart using the "Add to cart with free 2-day shipping" button on the right. If the button is not visible, just add the book to your shopping cart
login to your account, and sign up for free 3-month trial of Amazon Prime when prompted
If the "Add to cart with free 2-day shipping" button was not visible in previous step, select "FREE Two-Day Shipping with a free trial of Amazon Prime" shipping in your cart.
Sign up for the Amazon Prime free trial as prompted. After that, just remove the book from your cart.
Close your browser, go to the Amazon website again, login to your account, and select "Do Not Upgrade" button in your Amazon Prime membership section, to turn off your prime membership from automatic upgrade. You can do this step anytime.
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