I WAS certified but let everything expire. Need to be recertified in NRA Range Safety Officer and Chief Range Safety Officer this Winter/Spring. Need to pick up NRA Pistol and Rifle Instructor Certs too.
My usual sources are dark because of the holidays.
The NRA has online classes for RSO. I did mine this way. I would highly recommend taking some notes as you go through the videos, there are a lot of questions that are a little tricky. If you fail, you can retake two more times, but the questions will not be the same. All in all this is the way to go, do it right in your living room.