The store accepts digital cameras, MP3 players, GPS units, cellphones, graphing calculators, tablets and more. Though, as noted by PCMag, eReaders are not part of the program--not even Amazon's Kindle reader.
If your old gadgets match Amazon's specifications, you could be eligible for a decent chunk of money--definitely better than what you'd get for letting the items collect dust. For example, turning in a fourth-gen Apple iPod touch (32 GB) will earn you up to $152. Not too shabby.
Visit Amazon's trade-in store and browse the catalog of acceptable devices to see if your cast-off tech items meet the requirements.