I was fortunate, on my first and only renewal of my CPL, I was able to get the instruction from the husband of a woman I used to work with. They lived out in the country and had a shooting range on their property.
I think it was a 6 or 8 hour class which included lunch by Linda, his wife..........
Since then, Michigan didn't require follow up training and I was able to renew the license just as if I was renewing my drivers license......
It was about $150 each with a class size of 8 people. Definitely worth the money. Haven't seen a deal like that since.