I lost my right AirPods, can I get another one?

Warranty does not cover lost or stolen devices.

You can buy a replacement:

AirPods and AirPods Case Replacement - Official Apple Support

If you go to your local Apple store and make an appointment at the Genius Bar they can give you a replacement AirPod to purchase. They are $69 per replacement AirPod.

When you go make sure to bring the box they came in, proof of purchase (https://support.apple.com/en-us/HT202711), and everything that you still have that came in the box.

I hope this helps!!