At my university, they don't give grad students business cards and the only way to order them is to use an internal requisition code. Recently the university spent a huge amount of money on a new "branding campaign". I found some branding documents buried deep in the university website that specified exactly how university business cards should appear. Now I have some very convincing cards from a cheap online stationary vendor.

I give them out all of the time at conferences and other grad students here are always surprised that I have "official" university business cards.