Ouick, easy and inexpensive.
Go to the grocery store and grab a box or two of tubettini pasta, or similar variety and a few jars/cans of whatever spaghetti sauce is the cheapest. Cook the pasta, drain and add enough sauce to cover the pasta. Put into containers and freeze or refrigerate. This can be made for less than 50 cents per 15 ounces using store bought ingredients. If you "can" and make your own sauce, it's cheaper still.
Kids enjoy it. You can add sour cream or various cheeses to make a hearty meal out of it.