Many places on campus offer food in exchange for meal swipes. There are four main dining halls on campus: International Village, Stetson East ("Steast"), Stetson West ("Stwest"), and Churchill's (formerly Rebecca's). There is also a food court in Curry Student Center with many options, including the beloved Popeye's. Beyond these, many smaller cafe's can be found around campus, including 2 Dunkin Donuts in Hayden Hall and Shillman Hall, a Subway in Ryder Hall, and Wollaston's in West Village B and Marino.
For up-to-date information about menu's in the dining halls, see here https://nudining.com/public/dining-map