In the dairy products family, you could try:
Cheese, light or fat free = 2 oz
Yogurt, low fat and sugar free = 8 oz
Egg whites = 4
Eggbeaters = ½ cup
Cottage cheese, low-fat = ½ cup
And in the soy family:
Soy chicken patty = 1
Soy burger = 1
Soy hot dog = 1
Soy cheese = 2 oz
Soy milk = 8 oz
Soy nuts = 1/3 – ½ cup
Tofu = 4 oz
The amounts listed are a serving size.
Maybe those will give you some ideas?