The price is inadequate. I would pay $10, maximum $20 for it, especially taking into account that the subject is well documented in blogs and official documentation.
I wrote the book exactly to help who finds the official documentation too difficult to grasp as a whole.
I was in that very situation two years ago when I started with Bootstrap, and I thought that people out there will be in the same situation starting with Bootstrap 3 now.
$25 is a reasonable price for ebooks with a large amount of useful content but won't get impulse buys.
$5-10 will get impulse buys but you might not get as much money in aggregate.
$59-70 is ridiculous for any book, to me that is like textbook pricing.
I personally probably would've bought it in the $5-10 dollar range even though I know bootstrap and find the documentation easy to understand.
Best of luck.
Edit: I never made it to your $29-39 ebook pricing which might grab more people, might want to show that there are 2 options better (2 columns maybe).
I like the book and contents, but the price on the site is quite large. A can buy a bunch of tech books on IT ebook sites like Oreilly's for it. I would buy it without thinking for $10, with some thinking for $20, and for something around $30, I will buy only after thinking through about whether I really need it.
I had doubts about the pricing until the very last second before launching. But all in all, I just remembered all the work and passion I put in it, and decided to go on with this pricing.
Now that a good number of purchases are done, I just can't change my mind. So I'll go on, and learn whatever there will be to learn from this amazing experience.
I'm limited to reading this on my laptop and my phone now. It looks like good content. shame about the format.
That, and the difficulty (for me, at least) to get a decent book filled with screenshots and examples in epub / mobi, is the main reason why a chose to not produce Kindle-ready formats.
the git repositories are there to avoid to copy-paste from the PDF (which is an awful experience) the source code of Part 2. The bootstrap themes are nowhere to be found because I wrote them for the book and as an example for those starters the book is aimed at.
And for the first day the price is $59, which people seem to be happy with so far :)
Also, there's the book without the extras, if you think it could be useful to you... but I sense you are not a starter, now are you?
Not that I'm going to sue them or stuff.
What the hell is that supposed to mean?
Rephrasing: "but from what I can read, I guess you are not a newbie with Bootstrap nor frontend design (so the book is not for you)"
Your guess is wrong. If you had put the repositories and themes up on GitHub and dropped the price of the book to $20, I would have glanced at the ToC and most likely bought it.