Do you own a laptop? It's not as convenient as the kindle, but is likely better than the paper books.
Most online access codes give you a web-based ebook, so your chances of getting a .pdf are slim. A tablet, as arebelspy suggested, might do. Also, if you have a smart phone, you could try that; some of my students are able to get their books on their phones (turn off data and use wifi if you do this or you'll burn through your data).