What are some good publicly-accessible collections of case studies if someone wanted to start a discussion club? Someone once told me that part of the value proposition of the best business schools is the library of case studies that they amass (and sell). Is that true?
If you want good, you're unlikely to get free. We are talking about business, after all. The standard is HBR, which you can buy for what I believe is a reasonable cost: https://store.hbr.org/case-studies/
The BU libraries have a bunch of links. If someone had some knowledge of what they were looking for they could probably assemble a decent collection of relevant studies. The Harvard ones are the gold standard but, really, they're just a jumping off point for discussion if someone knows enough to capture the most important points.