Amazon discounts products it is selling from time to time. We were amused when we heard about the Kindle Paperwhite getting discounted. Amazon is offering $20 off on the device but the offer is not available to everyone. This is a limited time deal. If you have received the appropriate e-mail from Amazon, you should use the coupon provided to you to get the discount.
The deal is not available to everyone. It will expire on April 30th. Each promotion code can be used once, so you won’t be able to share your coupon code with others.