If anyone is looking for computer books, the Pearson Education stores are having Black Friday sales. Buy 1 - Save 35%, Buy 2+ - Save 55% on books, eBooks, and videos. Their ebooks are DRM-free but watermarked with your name on each page. Discount offer expires 11:59 p.m. EST November 29, 2014.
Que Publishing
Microsoft Press
InformIT
Cisco Press
Pearson IT Certification
Note that the offer pages list some titles but pretty much anything in each store is eligible for the discount (see the fine print for the few exceptions).