UPDATE: This offer is still available.
Amazon is offering a $5 off $25 Purchase Coupon! This offer expires 11:59 PM PST on August 22, 2013!. You just need to answer the back to school question, then share this offer to Facebook and your $5 will automatically be applied to your account. Be sure to request your credit now because quantities are limited!!
“Upon completion of the “Share & Claim” action, a $5 off $25 or more promotional credit will be automatically applied to your Amazon account. Promotional credits must be redeemed by 11:59 PM PST on Thursday, August 22, 2013. This promotion is available to customers located and with billing addresses in the United States. The promotional credit may only be applied to physical products shipped from and sold by Amazon.com, and excludes Kindle devices, digital downloads and gift card purchases. Limit one promotional credit per customer. Quantity is limited.”