Holidays are difficult. I never used a CM; the first year the nursery took dd1 back for the odd days (expensive), then I found a school holiday club/camp called mapalim, doubt that operates in your area, but there are more and more of these sorts of things. They were actually better than school, as covered a longer day.
My work also does a poorly-publicised holiday camp, worth asking, at least they would know there was a demand, and might know something locally too. Ask the school and the nursery too, these camps will send the school ads which you won't see yet as not in school. Also the after school club runs one, economical too. I never use that as dd1 is already there during the week (boring for her), but it has lots of fun activities.
Local councils may have info or even run clubs too, sometimes for particular sport.
Last summer a friend donated her niece for a week, she was nice and capable, luckily.
I start panicking about each of the 6 annual breaks from school, during the one before! Fun.