Mac and cheese...Hamburger Helper, bread, imitation Rice Krispies treats, potatoes...that's what we've been living on lately.
tings are sorta like cheetios but vegan... http://www.veganessentials.com/catalog/tings-crunchy-corn-sticks.htm
believe it or not, I'm perfectly happy with a baked potato and some sour cream w/ chives, that's so good. But if I'm out, my fave cheap food to eat is burgers with mushrooms in them.... yummy.