There are a bunch of small "fast food" type places right outside the UCF campus. If you are heading into Winter Park, there are a variety of places, depending on what part of WP you are at. Urban Flats is right on Aloma, in your price range.
PR's Taco Palace is a local mainstay, ultra casual, relaxed and fun... Good tex-mex and margaritas, but not much to look at.
PR's Taco Palace
499 W Fairbanks Ave
Winter Park, FL 32789
The places on Park Ave are a bit pricier, but right around the corner is Dexter's. Nice place, variety of food served from Apps, dinner salads, sandwiches and some entrees in your price range to more expensive entrees. Good bar and wine menu, live music regularly.