I’m frustrated

How can this be?

Attack and Defend Computer Security Set
By Dafydd Stuttard, Marcus Pinto, Michael Ligh, Steven Adair, Blake Hartstein, Ozh Richard
http://shop.oreilly.com/product/97811...
Ebook: $90.00
but at http://eu.wiley.com/WileyCDA/WileyTit...:
Purchase Options
Paperback
£60.00
€72.00

E-book
£39.99
€46.99

Regards
Rajaji
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