How about pizza by the slice at Bruno's? In addition to the full buffet, they charge $1 per slice. I get 1-2 slices, drink water, and my bill is a dollar or two. Can't beat that at Micky D's!
Also, if we are too lazy to fix a sandwich (or just don't want to invest in ingredients because it's the end of a stay and we don't want to have to throw out food), we pick up sandwiches for $4.59 each at Cocoon's and take them home so we can drink beverages that are cheaper because they're bought in bulk at Publix.
Or how about a pound of steamed shrimp from Goatfeathers for $9.99? That serves 3 for lunch at our house.
But please, no chain restaurants on 30A! I get enough of that junk food at home. We live in a small town, and fast food and chain restaurants are our only choices. They say you are what you eat - if I relied on eating out in my town, I'd be junk! LOL.