Addison-Wesley has chosen my Effective C++ Digital Collection (i.e., digital versions of Effective C++, Third Edition, More Effective C++, and Effective STL) as their December 4 ebook Deal of the Day. The bundle, which normally sells for $95.99, has been marked down to $39.99. At only about $13 per book, I think that's a very attractive price.
These books have not been updated for C++11, but most of the information in them remains fundamentally sound, and of course if you haven't yet migrated to C++11, they're as useful now as they've ever been. (For my perspective on the relevance of the information in Effective C++ in the C++11 era, take a look at this blog post.)