Not only do they offer teachers the chance to customize the textbook to suit their needs, the content is also free. Students can usually get the textbook for not much more than the printing cost.
Nate HoffelderView posts by Nate Hoffelder
Nate Hoffelder is the founder and editor of The Digital Reader. He has been blogging about indie authors since 2010 while learning new tech skills weekly. He fixes author sites, and shares what he learns on The Digital Reader's blog. In his spare time, he fosters dogs for A Forever Home, a local rescue group.