The Graduate School offers the Graduate Student Transportation Grant once during a student’s graduate career: http://gradschool.unc.edu/funding/gradschool/transportationgrant.html

The Center for the Study of the American South offers travel grants if your research has a southern connection:
http://south.unc.edu/grants-fellowships/graduate-support/travel-grants/

The Graduate and Professional Student Federation also offers travel funds:
http://gpsf.unc.edu/gpsf-funding/travel-awards/

The Carolina Center for Jewish Studies has travel grants for students working on Jewish culture and history:
http://jewishstudies.unc.edu/grants/funding-opportunities/

The Initiative for Minority Excellence offers the Graduate School Travel Award. This is distinct from the Graduate School Transportation Grant (above) and is open only to self-identified minority students:
https://uncime.web.unc.edu/funding/travel-award-application/