$20 seems a bit much for a single page PDF that is, I assume, only slightly different from the classic business model canvas [1].
The page does not explain why I should pay for the canvas, why is isn't the classic BMC good for a SaaS model? What is missing?
I would wager that most of the potential customers don't even know what the business (model) canvas is.
[1] https://en.wikipedia.org/wiki/File:Business_Model_Canvas.png