I am interested in finding great 2e boarding schools for my younger child (11 years). I am hungry for any and all suggestions of schools to look at. Thank you.

bump.

Have you tried contacting the 2e newsletter?
Recently reorganized as The 2e Resource.

They used to maintain a list of 2e schools.
This list may not be current, but contains 3 boarding schools.

Wishing you all the best to find a learning environment with a good fit to meet your son's needs.