I would recommend to sway away from the norm of the 'cliche' business case studies such as qantas, billabong, crumpler, etc. A lot of students will be doing them so markers will be just re-reading information so you will have to do something extraordinary to make your's stand out. The simple way out though is to just do something different, pick a business you are interest in and is fairly popular, like SONY or Westfield. This way you will make your's different from the majority and the marker's will also probably know less about the business
If you're having trouble finding case studies for particular dot points, I would suggest checking the popular ones (e.g. Qantas/Crumpler).
What also helped me was to read SMH - the business section.