A couple of older ads:
Nishiki
Giant

Nothing wrong with putzing around on a x-mart bike on campus either. Countless students run these all year long. I did for a couple of years. Sure, it'd be more enjoyable on something nicer but these things aren't going to spontaneously fall apart.

Some other possibilities but maybe out of your price range:
https://baltimore.craigslist.org/bik...655666585.html
https://baltimore.craigslist.org/bik...657840628.html
https://baltimore.craigslist.org/bik...671617523.html
https://baltimore.craigslist.org/bik...671811796.html