A good option for a nice, affordable meal is pizza. It's popular with families and non-SBDers, and you can have the leftovers (if there are any) at later meals, even at breakfast. No, I'm not talking about that frozen junk or the cheap, inferior pizzas people have delivered (where you have to eat half the pizza to be satisfied). You can quickly and easily make a great and inexpensive pizza at home.
I think the crust is what scares most people off. You don't need to make it from scratch (though if you have a bread machine, that might be an easier and even cheaper option). I use Trader Joe's refrigerated whole wheat pizza dough - it's less than $2.00 and cooking directions are on the bag. Other people buy ready-made whole-wheat pizza crusts. You can also use various kinds of toasted breads (whole wheat English muffins, etc.) to make mini-pizzas. For example, if you used toasted whole wheat English muffins, the total cost for the crusts would probably be about $2 to $3.
You don't need to use a special pizza sauce - regular canned tomato sauce, or even leftover spaghetti sauce will do. I use a small amount of both tomato paste and tomato sauce.
Here's just one discussion of SBD pizzas:
viewtopic.php?f=5&t=19933The biggest cost variable is the toppings. If you use cheap ones like onions and leftover meats, the cost would be pretty low. If you add more expensive ones like shrimp, anchovies, and sun-dried tomatoes, obviously the cost will go up. But even with a few pricey toppings, the cost is lower than many other dishes. And it's still cheaper than eating out. If you make a single pizza, you'll probably use less than half a package/can of many ingredients (like olives, mushrooms, and tomato sauce). You don't need much of any one topping. Here's an example of what a pizza I made might cost:
crust, under $2
tomato paste/sauce $1.50
mushrooms $1
anchovies $2
shrimp/lean meat $2
onions $.50
mozzarella $2.50
sliced olives $.50
olive oil, herbs, etc. - minimal
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Total, $12.00 for 6 to 8 servings (people may want more than one serving). You'd probably want to serve a salad or vegetables with this.
A cheaper but still very good version, with estimated prices:
crust, under $2.
tomato paste/sauce, $1.50
onions, $1
diced ham $1 (slice of ham that you dice yourself, not deli ham or pre-diced ham)
- or -
browned ground beef, drained, with seasonings $1 (you won't need to use much)
diced green bell peppers $.50
mozzarella, $2.50
olive oil, herbs, etc. - minimal
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Total, $7.50