As stated on the MEC website, graduate students are not entitled to a Student Card, for this reason, USP does not provide a Student Card for graduate students, such as the MBA. But the good news is that you can apply to organizations like UNE (http://www.une.org.br) or ISIC (https://www.carteiradoestudante.com.br), so you will be entitled to student discounts.
IMPORTANT! In any of these organizations, you will need to attach the “Declaration of Enrollment”, and this document is available in your Student Area. To do this, on your Dashboard, find the gray box “Documents and Attachments”, click on “Course Documents” and then on the name of the course. Once this is done, just choose whether you want to view or download the file.