At Amazon, trade in an old Kindle eBook Reader to receive a bonus 25% off the purchase of a new one. (The discount will apply automatically at final checkout.) That's on top of the Amazon gift card you'd normally receive, which can range up to $25, depending on your model. (You'll be sent a free shipping label for the old device.) The trade-in submission must be completed by December 28, and the discount expires February 28.