Practically every meal we eat is a budget meal because, well, because we just can't afford not to!
We eat mainly pork and chicken, beef in limited quantities because of the price. Sometimes burger's pretty cheap, but I would think considering the cattle they butcher for it eating it less frequently's probably a good idea.
I'm also a big fan of freezers. I've had a chest-type for years and last summer we picked up an upright as well. They're usually both full, and a freezer will pay for itself in six months, easily, with savings and less trips to the grocery store.
We cook a lot of simple meals because that's the way I like to eat. Since I measure or weigh everything I eat, meat and veggies/salad make it a whole lot easier. We do pork steaks with veggies on the side, or bake up pork roast with cabbage thrown in toward the end of it, or do the same with a roast chicken. Sometimes we have fish.
We also use ground turkey for stir-fries and sausage meat (it makes horrid meatloaf, though!).
The thing I've noticed about LCing is that meal prep isn't nearly what it was before. NO peeling spuds, NO peeling carrots, NO making pasta and boiling water for it, NO boiling water and taking 20 minutes to cook rice. The time-consuming things like salad, we do in the food processor (I have few teeth so this makes it easier to chew anyway
It also helps to shop at dollar and outlet stores. I pick up the really good mustards and some seasonings real cheap that way. Some spices we use so much of that it doesn't make sense to get the more expensive stuff.
Some of my favorite brands of things are store brands, too, although something I like certain brands better, but if I can save a buck here or there I'm going to.
Oh, make sure you check the labels of LC products before you buy them. Some of them aren't fit to eat (bad ingredients so they end up pitched), and others cost way more than a non-LC product when the non-LC version was LC to begin with! I don't buy much in the line of LC products, but there are a few we use.