I lost an air pod and need a new one, can I purchase just one air pod?
Can I purchase only one air pod to replace the one I lost?
Question marked as
Yes. See the following from How to find your lost AirPods, AirPods Pro, or AirPods Max - 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 AirPods pricing and service options.