If your textbook also exists as an eBook, they are the same book just in different formats (please note that the eBook might show up as a separate search result from our print version).
It’s up to you to decide if you like that format and if you still want to purchase a print copy.
However, the devil is in the details: not all books can be downloaded to a phone/tablet, and most books have limits on the number of pages you can download/print.
If you have questions on an individual text, please contact libraryhelp@erikson.edu