It looks like Amazon is blowing out their stock of the original MagSafe 1 power adapters. New ones retail for $80, but these open box ones are listed at ~$10 (plus an additional 15% discount for some reason) for one in "very good" condition. I've ordered a dozen of them for work and home. If you have a laptop that takes a lower wattage adapter, you can still safely use these. Also if you have a more recent MacBook with the MagSafe 2 port (and let's face it you probably do as it is now 4 years old), then you can pick up a converter for $10, and optionally a converter keeper (2 for $10) to prevent it from getting lost. Total cost of a spare power adapter: $25.