Good for you. I paid around 70 per month and it only covered the subway network between my apartment and the university. Or whole network for 85. That‘s not exactly cheap.
>>quonn+(OP)
Beginning 2013, there is the semester tickets for students, which is twenty euros per month.
Before that, 70 euros? Where were you living, Freising?
Two external rings were around 50 euros at the time, and many students rent inside the (old) 4 inner rings, or the first external one if you study in Garching