I have one meal...it's very low in calories and very high in protein..but they don't suggest you eat it more than 2-3 times a week. But i love Albacore Tuna with sugar free salad pickle cubes. A can of that and a couple spoons of pickles are like 150 calories for the whole can, 1 gram of fat and 30 grams of protein. Sometimes i like to scoop it up with a single serving of tortilla chips.
Also, for breafast a pretty simple, easy, low cal, high protein for breakfast is egg whites, fat free cheese and 1 0z of luncheon meat. I like to make it into omlets. I use half a cup of egg beaters, 1/4 cup of fat free cheese and usually one thin slice of turkey/chicken/ham luncheon meat. It's like 100 calories all together for the breakfast. You could also throw in a peice of fruit to make it healthier. I just eat my fruit a couple hours later for my snack.
I eat alot of chicken/tuna/egg whites/yogurt/bananas. Those are the things i buy just about every week.