Favorite quick and cheap lunch spots in the Loop

I think it'd be useful to have a thread where people list their 5 favorite spots for a quick (<30 mins) and cheap (<$10) lunch in the Loop. I know I'm always looking for new options to try.

Here's my list

Veggie combo at Oasis Cafe (21 N Wabash)
Salads at Sopraffina Cafe (10 N Dearborn)
Bowl of Ramen at Takashi or a Huarache at Frontera Fresca at Seven on State (111 N State St, Macy's)
Half a Chicken at Chicken Planet (21 W Jackson)
Cheeseburger or Chicago-style dog at Max's (20 E Adams)