If you were interested in making your own, here's how I do the pages. This was 13 minutes for one page (one page plus the cut outs), and most documents are 20+ pages. Many of the pages are very similar, so I'm able to just copy/paste and then rearrange.
Here's a video in real time of how I create the binder pages I've got for sale (mostly-montessori.com/products). It's not super complicated once you figure out the canva.com site. It just takes time and patience!
Enjoy!
