Tap water=very cheap
Tuna=30 cents a can=30 grams protein, 0 carbs
boneless chicken=3-5 bucks
I live on the east coast(MD) and use dpsnutrition.com. I get my supplements the next day. Whey protein for 5 lbs=28 bucks
Just a few starters for you. If you begin with at least a gallon of water a day, and 1 gram per pound of body weight for protein, this will get you started.