Please let me know if you would like the library to add a book, eBook, DVD, journal, or other item to the library's collection.
As the subject librarian for the School of Business, I can:
Probably the Most famous business cases are those published by the Harvard Business School Press. While these are not directly made available to Libraries, they can be searched and purchased at the HBSP website. A small number of the HBSP cases are published in the Harvard Business Review, which is available in the Library in print and online in EBSCOhost's Business Source Elite database.
Other Sources--some free:
Acadia Institute of Case Studies (focus on small business and entrepreneurship)
The Times 100 (case studies written by Financial Times)
Some cases also available in ABI/INFORM, Business Source Elite, etc., and searchable by subject/topic and indexes and using filter "cases" or "case studies."