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I'm studying for the new exam myself, here is the book I'm reading. This is the only website I have found that has it available right now too.
https://www.safaribooksonline.com/library/view/ccna-security-210-260/9780134077857/
New book on v3.0 can be read online right now:
https://www.safaribooksonline.com/library/view/ccna-security-210-260/9780134077857/
Studying for the new test right now. Hopefully someone will release the physical book of it soon...
Sorry, OCG is Official Cert Guide, as in http://www.amazon.com/CCNA-Security-210-260-Official-Guide/dp/1587205661
And as a disclaimer, I took the old versions of the test last year, so I don't know how the new books are holding up. I know Chris Bryant says he updated his videos, but I haven't watched them to see. Generally speaking, though, you should get the majority of the material in what's out there. There's also a ton of material on Youtube and such, just to see a different point of view.