I like to assemble my own. I was a teacher for 5 years in the schools, so I like assembly a lesson plan
There is so much on the Internet - each time I plan to the next month I just Google (this month was bugs) "Insect math prek" or "bug books" or "bug sensory bins" and there is so much to choose from! This is my first year with set monthly themes, but next year I will have it all assembled for the most part. I even make a spotify list of songs that go with our theme for dancin...gotta dance! I would be happy to email you my yearly plan if you like.