Is your textbook out of date, not relevant to current events, or do you need more flexibility to be able to customize your content?
One idea to consider is using podcasts to replace your textbook. Most are free to access, up-to-date, released on a regular schedule (weekly, biweekly, monthly) and available on mobile devices through a podcast streaming app such as Google Podcasts or Apple Podcasts.
Check out the recent webinar delivered by Audrey Wubbenhorst of Humber College (see video and slide links).
Audrey teaches Public Relations and found that podcasts allowed her to stay on top of current events in the news as they happen. Her students didn't have to purchase an expensive textbook, took more interest in the course material and found new voices and perspectives around topics. She also mentions that podcasts helped her English-as-a-Second-Language students learn the language better through listening and reading the transcripts.