"$47 is more than I want to spend on books right now."
Fair. The bundle is $47 because four books at retail run close to $100, and I wanted the price to be low enough that any working teacher could clear it without thinking.
One honest thing, though. A workshop you teach with the material in these books, even one workshop with six students at $30 a head, pays for the bundle four times over.
"I don't have time to read four books."
Then don't. The bundle is for the teacher who wants the material to be there when they need it. Read the one that matches what you are wrestling with this month. Leave the others on the shelf. Come back.
These are field manuals. Keep them near the mat, near the studio, near the kitchen table where you plan your classes.
"I already have a lot of teaching books."
You probably do. These four are written from inside thirty years of running rooms, training other teachers, and treating bodies clinically.
If you are early in your teaching life, the bundle will outlast your current questions. If you are deep in, it will name things you have felt for years and could not articulate.