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Buy the eBook at the link below with a 45% off coupon code (and you get it in 3 formats: .mobi, .pdf, and .epub — UNBELIEVABLE. (I have never gotten more than one format of the eBook anywhere). http://www.informit.com/store/effective-javascript-68-specif...

Here is the 45% off discount code: IUGD45 (45%)

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Many tech publishers now sell their ebooks as bundles: one price for multiple formats (usually the big three, sometimes even more). O'Reilly, PragPublishing, NoStarch, Informit spring to mind. (Not saying that it isn't a good thing, but I'm surprised you think it's rare.)

Thanks for the info, telemachos. I have always bought my eBooks from Amazon and, on some rare occasions, from iBooks iPad app. So I am happy to know there are better deals outside of Amazon.

In most cases, however, the eBooks (Kindle) are cheaper on Amazon, but I am willing to pay a few dollars more to get the eBooks in all 3 formats (.pdf. .epub, and .pdf). I personally prefer to use iBooks (.epub works fine), when I am on my iPad, and the .pdf—when I am on my laptop.

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