When I first started teaching I used those spiral bound store bought lesson pan books. As time went on I began creating my own. They have morphed over the years to include more than just my weekly lesson plans. In it I keep student contact information, schedules, staff meeting notes, email address, IEP's and so much more. Here is my newest book.
Or if you don't need all the extras, you can check this one out It doesn't come with all the programmable pages, just a cover and plan pages.