Simple - Croissants and sandwich stuff. Or regular bread too, but croissants are so much better mmm. And it's a nice twist.
Chicken breasts and a can of cream of mushroom soup. Veggies. I buy frozen they are pretty cheap.
Fish...any kind, but usually I buy this salmon that is only like $7 for 5 or 6 fillets. Veggies. Can never have enough veggies stocked up! lol And usually rice.
Tattertot casserole - hamburger, cream of celery/mushroom soup, whichever veggies you like in it, velveeta/store brand ceese, and of course tattertots.
Spaghetti - well you know how to make it I'm sure. Actually lots of pasta things are cheap. Fettucini Alfredo, I usually just buy a jar of alfredo sauce, but if you know how to make it I'm sure it's cheaper. Bowtie noodles with cheese and corn mixed or peas.
Tortilla wraps - basically a sandwich in a wrap.
Hmmm I'm sure I can come up with more. I like cheap and have got it mastered when shopping for the three of us when it comes to groceries.