Searching for First Reader books

My oldest son is showing more interest in words and reading, so I'm on the hunt for easy and first reader type books to share with him. He loves a book called Drip, Drop by Sarah Weeks, part of a collection of books called I Can Read.   So I'm going to explore these types of books.  I'm not sure if we'll discover new favorites, but I promise to share the best of the bunch.
Drip, Drop (I Can Read Book 1)