Tickets are $5 for MIT/Wellesley students/faculty, $6 for all others, and are available at the Source in the MIT Student Center on 84 Massachusetts Avenue.
If driving, a map and directions are available here.
If coming by public transportation, the easiest way to get to the Media Arts Center is by the subway. Take the Orange Line to the Roxbury Crossing stop. The Media Arts Center is across Columbus Avenue from the exit.