If you have taken Mikhael’s words of advice and found that your power adapter needs replacing or you’d just like to have a backup, we have what you need.
Don’t be fooled by cheap knock-offs you find other places. These are official Apple power adapters that are built to last.
Be mindful of which adapter you need as the MagSafe and MagSafe2 have different ends that are not interchangeable. But, if you happen to have a healthy MagSafe adapter that needs upgrading to fit a MagSafe2 port, you can always pick up the adapter for just $10.