Free $10 Amazon Kindle eTextbook Credit

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Amazon is offering $10 off on Kindle e-Textbooks when you follow the instructions below. Offer is valid until January 9, 2012.
    
    1. Log in to your Amazon account and then click here
    2. Click on the "Enter Your Code" button and apply code ETXTBOOK
    3. A $10 Kindle credit will be automatically applied to your account.
    
Note: When purchasing an e-Textbook, be sure to check if it qualifies for promotion. If it works, it will show:
        This book qualifies for Kindle e-textbook promotions. If you’ve applied a valid promotion code to your account, the dollar amount of your code will be automatically applied when you buy this book with 1-click (promotions also apply on 1-click rental orders when a rental option is available). After your purchase or rental, you can confirm that your code was applied by checking your order confirmation, which will be sent to you by e-mail.