Great source for cheap, DRM free e-books: https://www.humblebundle.com/books https://www.humblebundle.com/books (Particularly from O'Reilly, No Starch, Mannin

Great source for cheap, DRM free e-books: https://www.humblebundle.com/books https://www.humblebundle.com/books (Particularly from O'Reilly, No Starch, Manning, ... )