At least $600 a month. We try to cut it down, and I think this month we will hit $400 from eating a lot of mac & cheese and pancakes b/c money is incredibly tight.
Groceries here are expensive, I have 3 kids who eat like they are starving to death, a diabetic dh who eats us all under the table, and I'm pg.
I try to buy mostly fresh fruits & veggies and organic when possible. I have absolutely no room for storage (under 600 sq ft for all of us and a kitchen the size of my washer and dryer), so I can *not* buy bulk. That is a concern. We have WIC which helps now with milk and eggs. But they won't give us soymilk in IL on it, so we do that out of pocket (most of us are lactose intolerant).
We don't eat out a lot, but when we do we get it super cheap-$10 to $20 tops.
Even though we spend so much, it's still what the USDA says is average, we very rarely buy junk food (I splurged on some natural Cheetos and dh gets stuff for work-he has to have lots of food on hand with his diabetes).
I try desperately to cut it down each month, but I always fail.