Yeah, I have two teens, so we're in the $600-$700 range....and that's just groceries. The problem with kids today is they don't like all of the cost savers our parents got away with.
I used to love .99/lb. bologna. They will only eat turkey breast (not that processed turkey either...they need the expensive stuff).
I used to eat American cheese. They only like colby, cheddar, or munster.
I used to eat Campbells soup (in fact, Alphabet soup with a bunch of crushed up crackers is still one of my favorite lunches ). They only like Progresso or Chunky soups...3x as expensive and 1/2 the servings.
The list goes on and on. Can't wait until they have to pay for their own food