Lost 1 Airpod

In the US, $69 or for an AirPod Pro $89. For all countries click the pricing link below.

See the following from How to find your lost AirPods - Apple Support

If you still can't find your AirPod or Charging Case, or if something is damaged, get the serial number and then contact Apple Support for a replacement. Then learn how to set up your replacement.

You can also learn more about AirPod pricing and service options.

Note that I edited my original post and corrected the prices.