Fanatical have just entered the book market with a number of eBook bundles on a variety of subjects including Blender, Unity, Unreal and C++ development. In the case of the Unreal and C++ books you can even buy individual books or smaller bundle packages to suit your needs. Additionally there are bundles on machine learning, security, blockchain, Wordpress, command line and more.
The primary bundles of interest to game developers are:
The books in this bundle are from Packt Press, which can vary massively in quality. Several of the books have also been in prior Humble Bundles, so be sure to check your Humble library before making a purchase. All of the above links contain an affiliate code that helps support the channel if you use them to make a purchase (and thanks if you do!).
Learn more about the bundles in the video below.