Inexpensive food near Gene Siskel Film Center
Sandwiches at Hannah's Bretzel - www.hannahsbretzel.com
Sandwiches at Pastoral's new location on Lake St - www.pastoralartisan.com
The food court at Marshall Fiel... I mean, at Macy's - www.macys.com
Burgers at Petterino's (steakhouse) - www.petterinos.com
And of course there are all the fast food and sandwich chains in that area.