I was going to make the same suggestion. This book is one of those that seem like the insights presented are mostly trivial and obvious, but then you notice tha

I was going to make the same suggestion. This book is one of those that seem like the insights presented are mostly trivial and obvious, but then you notice that it has completely reshaped your perception of a class of problems. Plus, it's popular enough that there is a good chance you can find it at a library. (In fact, the first time I read it, I got an older edition from a library. I since bought a newer edition to re-read.)