All along Rainier Ave S, you will find cheap Vietnamese noodle shops. Pick one, any one-- you can't go wrong. Enjoy SE Asian style salads (usually with spicy-sour dressings and meat or seafood), spring rolls, grilled seasoned meats over rice vermicelli, or a steaming hot bowl of pho. They're authentic and cater to Vietnamese immigrants, but you'll see plenty of other Seattle locals eating there too. Five or ten bucks will more than pay for your meal, depending on your appetite.