At Amazon, trade in an old Amazon Echo or Tap device to receive a bonus 25% off the purchase of a new Echo device. (The discount will apply automatically at final checkout.) That's on top of the Amazon Gift Card you'd normally receive, the amount of which depending on your trade-in model. (You'll be sent a free shipping label for the old device.) The trade-in submission must be completed by March 29, and the discount expires May 31.