My first step in the hunt for books was to know which levels I needed for the clubs. I know that for nonfiction it is acceptable to go down as much as 2 levels, but I am not sure how this transfers to narrative nonfiction (if you have an answer to this please share in the comments section).
My next step was to check in our school Media Center and see which Guided Reading sets matched my genre and levels.
Then I looked on my book shelves to see if I had multiple copies of books that matched my search criteria.
I also looked through the ancillary materials that are part of my Social Studies textbook program. Time for Kids and the Harcourt leveled readers each provided me with a set of books--yay!
Finally, I used the website Reading A-Z since I was not having much luck finding lower level books. Reading A-Z has something called multilevel books which are wonderful because you could have three different groups reading the same book that is three different levels.
Now I have an idex card labeled with each Fountas and Pinnell level. I recorded the books I have for each level. Now I can see how many sets I have and how many more I need.