Ok so I fooled you a little bit in the title. Dropbox didn’t just suddenly roll out a new teacher programme that gives you 12 gb of free space.
But it is really easy, for teachers especially, to get free space. Every September teachers are exposed to a wealth of untapped Dropbox gigabytes. Your new students probably do not have a dropbox account yet. So instead of emailing them todays worksheet every day. Put it in a shared folder and share an iBook, video, answers to a test, anything really via dropbox. As soon as these students sign up and install dropbox you get 500mb per students.
So take the average class of 24 students x 500 mb = 12 free gigabytes.
You can get up to 16 extra gigabytes via referrels this way so repeat the process to get even more.
Bottom line is: Students will sign up for Dropbox eventually. So why not introduce them to it and get extra space out of it.