Here is a typical grocery shopping list of mine
10 cans of tuna 5 bucks
2 lbs of Oatmeal 1.00
Gallon of 1% fat milk 2.00
32 oz of fat free cottage cheese 3.00
Loaf of 100% whole wheat bread 1.00
5lbs of boneless skinless chicken breasts 10.00
5 dozen eggs 4.00
cocoa pebbles 2.00
Jar of natural PB 2.00
Bag of Broccolli 4.00
Carrots, Tomotoes, onions, bell peppers and (other misc veggies) 3.00
1 lb of Roast beef 4.00
For a grand total of about 40 bucks.
That will usually be enough for about a week or so. I always shop around for the best deals, and only buy stuff that I can find on sale though. I have 4 grocery stores within 2 miles of my home and I always keep a lookout for great deals, and stock up.
Of course I buy other stuff like oils, salt, mustard etc. But that stuff lasts awhile and I'm not buying it every week.