Children's book club kits available from Indiana State Library. Free to those with InfoExpress. Several of the titles are fairly recent, used in many schools
Questions and Answers on Intellectual Freedom from the Cooperative Children's Book Center. There are already many pre-existing questions and answers, and you may also send a question privately.
This blog, started by two New York moms, reviews many children's books. They are searchable by title, author, reading level, and more. Their rating system is a bit different than many other (such as levels of humor)
Readings with free activities that are lexile-leveled. It is designed for grades K-6, but there are many readings with lexiles scores of 800-1020. Also, it provides lesson plans aligned with various children's books.
You can create a free account. Rec by Karen Ault