Hello there objektiv. Good day and thank you for the inquiry. You may try check our DJI Where To Buy platform on this link ( https://www.dji.com/where-to-buy ) to see if those lenses that you need for your DJI Osmo Action is available. In addition I hope that you can get some recommendations from our DJI members who owns the DJI Osmo Action with regards to this inquiry as well. Thank you.
The OA use the same 12 mm fine thread other action and dash cameras use, so your task is to find one that are a megapixel lens and lots of them, and then are compatible with the sensor size in the osmo action.
And of course as many of the places that sell these lenses are geared for CCTV, they you will need to have the seller glue in a IR cut filter, or do that yourself.
With many lenses you will probably not be able to have the lens protector screwed on
you can get okay lenses for okay money, but you can also blow a fortune on this quickly.