I live two blocks away from Red Line Clark/Division stop. When friends coming from outside of town to visit me, I often take them to the closest Walgreens to get day(s)-passes.
When they see this type of good deals at Walgreens, they often compliment it with a surprise. They might be pay $2.00/$2.25 for each ride during the days in Chicago without knowing the day(s)-passes.
Not a lot of CTA stops sell this kind of passes. The only stop that I’ve seen selling them is Blue Line O’Hare stop. Other than that, I’ve never seen any other place selling it.
However, not many people know this type of deal are sold at Walgreens either. If every CTA stop has several ticket machine, why not install another one for this type of deal. It seems like a hidden-deal that most people don’t know about, or even they know, they don’t know where to buy it.