I have a few books that were publishing by Packt Publishing . They are specialized in IT books and ebooks and have a wide offering. Books I bought handle Drupal, Blender, Unity and SketchUp (for use with Unity) as discussed in an older post . If you register on their site before the end of this month, they will present you a nice free offer (not purchase required) to celebrate their 1000th book. The books are priced fair, they are delivered for free and when you combine a paper book with its ebook, you get a good price reduction. All paper books I have where in Black and White and if you are looking for quite graphical software (e.g. Unity) the images sometimes tend to be a bit dark. The ebooks are in full color.