But if you don't mind reading electronic books, it's only $3.99 for the Kindle version now. (You don't need a Kindle; you can read these online or on your computer.) Once she gets it perfected, I'm sure the price will go up.
Here's a peek at part of her chapter on home-made manipulatives:
Or put the number line at a slant, like a hill on which you can run up and down. In many applications of math and physics, “zero” is an arbitrary location, based on whatever makes our problem easy to solve.
In this case, you might invent a peasant who lives in a small hut at 0, partway up the hill, and dreams of becoming a knight. At the top of the hill is a castle, and at the bottom there is a cave where a terrible dragon lives. Take turns making up story problem adventures.I don't know when I'll have time to savor the rest of this book, but I'm definitely looking forward to it. It'll be even nicer to have the print copy in my hands one day. I'll be waiting...