When it comes to offering sandwiches in their retail locations, operators are most likely to offer them as a made-to-order option. Only one operator—from a college or university—said sandwiches were not an option at retail locations.
The Bleacher Report posted a fairly arbitrary slideshow about the coolest food items offered at the top 25 college football stadiums. Some choices are from off-campus restaurants, but there were some shout-outs for the colleges' respective foodservice operators. I know not every dining services department handles concessions for their institutions but a few of these menu items seemed interesting enough to share.