Yup - probably the cheapest!
I'm getting into my weights, so trying a farily high protein diet at the moment but on a budget - meals sort of go like this
Breakfast - 7am
Vanilla Whey Protein, tbsp peanut butter, 1 or 2 bananas, milk
Breaksfast 2 - 9.30am
2 eggs(fried or boiled), baked beans
Lunch
Chicken breast (I use frozen), cup broccoli and mixed veg + brown rice or 1 sweet potato
Dinner
turkey stir fry (no noodles) and some cottage cheese
Snacks
Nuts, seeds and may be a cheeky snickers now and again
3 protein shakes a day (incl breakfast one mentioned - other two are pre and post workout)
Normally works out about 240g protein per day