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Through tonight, Amazon.com is offering a $5 off a $15+ book purchase when you enter promo code GIFTBOOK at checkout (limit one use per account).
Shipping is free on a book order of $25 or an order of $49 or more. Amazon Prime members (sign up for a 30-day free trial here) can get free 2-day shipping. You may also be able to choose free no-rush shipping and receive a $5.99 credit for Prime Pantry or a $1 credit for ebooks and more (this will vary by user).