If I take time to prepare a bunch of freezer meals and esp. frozen breakfasts (egg burritos, english muffins/eggs/sausage, pacakes, waffles etc), oatmeal packets (pre-measure everything, they just need to add milk and heat), then our budget looks good.
They love cereal, but just like PP's said it disappears quickly and they are hungry again soon.
Popcorn is great as a snack. We pop it in the microwave in brown paper bag and add the toppings. Try PB2 sprinkled on top if you guys like PB taste.
I love Winco bulk section. Spices, couscous, quinoa, nuts.