My professor has just realized that she should have told us to buy the second edition of a book she is requiring. Most of us bought the first edition. It's a bit late to be trying to find the second edition now.

She also required a book that we've just learned is out of print until April. As it happens, I got that one, but most of the class couldn't find copies. Now what?
This is the same professor who "required" a whole bunch of books last semester that we never discussed in class.