Until 05:00 PT 2/December/2014, O’Reilly are offering 50% off all E-books and Videos at http://shop.oreilly.com/category/deals/cyber-monday.do?code=CYBERDY. (Discount is 60% if buying over $100.)
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p.s. APress are also going to have a Cyber Monday sale but that sale does not start until Monday!