I don't know if the USA has Little Caesar's Pizza, but they have a $5 medium pizza thing. $5 for a whole medium pizza is pretty darn good.
There's also a sandwich store with sandwiches for $6, but the meat in the sandwich is literally an inch thick. You can't eat more than half the sandwich, so you can just take the other half for the next day. $3 for a huge lunch is goooood.