Here is fascinating collection of facts about digital textbooks, including a comparison of the prices of text vs digital
Unfortuntely, not much thought was put into this infographic. While many of the facts are technically correct, many are not relevant or are out of context. For example, this infographic compares the price of digital textbooks vs the list price of paper textbooks. No one pays the full retail price if they can avoid it, so it has little relevance.