I just came across Johannes Kleske's recommendation

and so I took a quick look at the web site of his recommendation, "Business Model Generation". The header says:

Because I highly trust Johannes' book taste, I immediately ordered it. But after going through the PayPal transaction process, I got:

What's the lesson here? Business model is only one part of the equation. The most important part, though, is business execution.

Your claim and your message may be as great as it can be. If you fail at delivery, you're out. (Not that I didn't have to learn this the hard way myself.)

I hope that I'll get the book anyhow and its content trumps their transaction handling.