Pinterest. It seems to be very big in the home schooling community in the US although I am not sure how much it is used in schools.
It looked quite interesting so I thought I would have a go at making a sample lapbook using some of the more commonly used minibooks. I bought some cheap manilla folders at the Warehouse and, seeing as this is a sample and I wanted it to be somewhat sturdy, I used lightweight card for the books. For some of the books, I used templates made by The Candy Class. These templates come with detailed instructions in both pdf and Powerpoint form which would be very handy if you were using them with a class.
The lapbook was not difficult to make. I would imagine that the main challenge would be planning what kinds of books/information would work best for the topic you are doing. I am thinking about making one for my pepeha, which might make a good back to school activity.