My wife stays home, so we make our meals from scratch (no box mixes, etc.).
We eat oatmeal for breakfast every morning. We buy a 50lb bag of quick oats for $25, and it lasts us about 2 months. We don't use milk.
Lunches are usually leftovers or, if there aren't leftovers, fruit, veggies, popcorn, oven fried potatoes, or eggs.
Dinners:
pizza (from scratch)
rice-based dishes-- stir-fry, taco rice,
sandwiches (homemade bread)
scrambled eggs/sausage/potatoes
pasta w/veggies & meat
burritos
lentil soup
pea soup
chili
pancakes (w/nuts, fruit sauce, sometimes gravy)
My wife doesn't like to follow recipes, so most of the time she just "wings it" and things turn out pretty well. We try to make sure we eat some sort of green(ish) vegetable and a whole fruit per person every day. Bananas are a great & healthy inexpensive fruit (we get them at Costco for under $0.50/lb).
We have a big chest freezer, so when there is a good sale on meat or cheese or butter (or ice cream, as you can see in May...), we stock up.
Price-points I look for when grocery shopping (or rather, when looking through the flyers making a list):
Beef: under $3-4/lb (usually ground, or sometimes weekly specials)
Chicken: $0.88-2/lb (whole chickens will go on special for under $1/lb, boneless skinless pieces I'll find occasionally for $1.99/lb)
Pork: under $1.50/lb
Eggs: $1/doz
Fruits & veggies: under $1/lb (I can get frozen mixed veggies for under $1.50/lb at Costco; I keep those in the freezer for weeks when there isn't a good veggie sale)