we try to buy generic anything. unless the name brand is on sale for cheaper of course. i find that most generics taste the same or are better than the brand names too. in addition to that we go to costco where we buy in bulk. i'm not sure if that's cheaper than shopping at the regular grocery store but it sure does cut down the trips needed. we also keep a very well stocked pantry of canned goods, dry items like pasta, cereals, grains, plus juice, condiments, and paper products. we do one big costco run a month and we do a giant eagle run usually at the same time. then we fill in the rest of the month at our little local grocery for fresh fruits and veggies and lunch meat, milk, bread and so on, you know, the stuff you run out of through out the month.
i'm pretty sure that our monthly food budget is about 350 - 400.