The VSB Student Card for various tarif zones can be bought directly at the university in the university stores (Furtwangen Room B 1.01 and Schwenningen Room A 0.13) with your EC card.
The VSB Student Travel Card is valid for one semester. With this card you can travel inexpensively (for 6 months for the price of 4 months) with the bus or train in the VSB network. At weekends and on public holidays from 2.00pm on, you can also travel on the routes of the partner networks in all buses, local and regional trains of the German Rail Company (Deutsche Bahn) with the exception of the IC, EC and ICE trains.
Further information can be found in the VSB Customer Centre in Villingen or on the VSB website.