The Nook version of +Professional Android 4 Application Development is available now for $26.

Amazon say they'll have the paperback in stock on Sunday, so if you want a copy at the start of next week, now's a great time to pre-order :)

Handy links to a bunch of different buying options can be found at:
http://blog.radioactiveyak.com/p/professional-android-4-application.html
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